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Applications of Logarithms
Ex) If you invest any amount of money at 11.25%
compounded quarterly, how long will it take to DOUBLE?
r
A = P(1 + n )nt
Ex) Craig invests $1000 in a mutual fund which is
supposed to grow at 10% compounded annually.
Laura has concerns about the stock market so she
buys $2000 worth of bonds paying 5%
compounded annually.

After how many years will Craig's investment be
equal in value to Laura's?
Ex) Determine how many monthly investments of $200
would have to be made into an account that pays 6%
annual interest, compounded monthly, for the future value
to be $100,000.

FV = R[(1 + i)n - 1]
i
Ex) A person borrows $15000 to buy a car. The person can
afford to pay $300 a month. The loan will be repaid with
equal monthly payments at 6% annual interest,
compounded monthly. How many monthly payments will
the person make?

PV = R[1 - (1 + i)-n]
i
Continuous Growth + Decay Problems
Ex) The population of a certain country is 28 million
and grows continuously at a rate of 3% annually.
How many years will it take for the population to reach
40 million?

A = Pert
Ex) A radioactive substance decays so that the
amount present is "P" grams after "t" years according
to the following: P = 50e-0.135t. What is the half life of
the substance?
Half life = the amount of time it takes for the substance
to decay to half its original amount.
Logarithmic Scale Problems
Ex) The most intense earthquake ever recorded was in
Chile in May 1960, with magnitude 9.5. In January 2010,
Haiti experienced an earthquake with magnitude 7.0.
a) Calculate the intensity of the Haiti earthquake in terms
of a standard earthquake.
b) Calculate the intensity of the Chile earthquake in terms
of a standard earthquake.
c) How many times as intense as the Haiti earthquake was
the Chile earthquake? Give answer to the nearest whole
number.

M = log( I )
S

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Day 78 examples u6f13

  • 1. Applications of Logarithms Ex) If you invest any amount of money at 11.25% compounded quarterly, how long will it take to DOUBLE? r A = P(1 + n )nt
  • 2. Ex) Craig invests $1000 in a mutual fund which is supposed to grow at 10% compounded annually. Laura has concerns about the stock market so she buys $2000 worth of bonds paying 5% compounded annually. After how many years will Craig's investment be equal in value to Laura's?
  • 3. Ex) Determine how many monthly investments of $200 would have to be made into an account that pays 6% annual interest, compounded monthly, for the future value to be $100,000. FV = R[(1 + i)n - 1] i
  • 4. Ex) A person borrows $15000 to buy a car. The person can afford to pay $300 a month. The loan will be repaid with equal monthly payments at 6% annual interest, compounded monthly. How many monthly payments will the person make? PV = R[1 - (1 + i)-n] i
  • 5. Continuous Growth + Decay Problems Ex) The population of a certain country is 28 million and grows continuously at a rate of 3% annually. How many years will it take for the population to reach 40 million? A = Pert
  • 6. Ex) A radioactive substance decays so that the amount present is "P" grams after "t" years according to the following: P = 50e-0.135t. What is the half life of the substance? Half life = the amount of time it takes for the substance to decay to half its original amount.
  • 7. Logarithmic Scale Problems Ex) The most intense earthquake ever recorded was in Chile in May 1960, with magnitude 9.5. In January 2010, Haiti experienced an earthquake with magnitude 7.0. a) Calculate the intensity of the Haiti earthquake in terms of a standard earthquake. b) Calculate the intensity of the Chile earthquake in terms of a standard earthquake. c) How many times as intense as the Haiti earthquake was the Chile earthquake? Give answer to the nearest whole number. M = log( I ) S