3. Perform computations and solve problems To determine the percentage of a quantity Convert the percentage into a fraction with 100 as the denominator Multiply the fraction by the quantity Example: find 20% of 150 = 20 x 150 100 = 30 sELamAThARirAYa
4. Finding a number given the percentage To find a number given percentage Divide the given value by the percentage given Multiply by 100 Number = given value x 100 given percentage sELamAThARirAYa
5. example Find the value of m if 15% of m is 90 Solution: 15 = 90 100 m m = 90 x 100 15 = 600 sELamAThARirAYa
6. Finding the percentage of increase or decrease A change in a value can be shown as an increase or decrease from the original value Percentage increase = increase in value x 100% original value Percentage decrease = decrease in value x 100% original value Decrease in value = original value – new value sELamAThARirAYa
7. example Last year, the bus fare for alice was RM48 per month.This year the new bus fare is RM52 per month.find the percentage increase of bus fare. Solution: Increase in value = 52 – 48 = 4 Percentage increase = 4 x 100 48 = 8.33% There is 8.33% increase in the bus fare. sELamAThARirAYa
8. Profit and loss Profit is the money realized when an item is sold above the cost Loss is the money lost when an item is sold below the cost Profit = selling prices – cost prices % profit = profit x 100% cost price Loss = cost price – selling prices % loss = loss x 100% cost price sELamAThARirAYa
9. discount Discount is reduction on the original selling price of an item Percentage discount is the percentage taken off the price Discount = original selling prices – new selling prices % discount = discount x 100% original selling prices Discount = % discount x original prices sELamAThARirAYa
10. Simple interest Simple interest is the amount paid by bank to the depositor on the principal alone for a stated period of time Interest rate is the percentage of interest given on principal for a period time Simple interest = interest rate x principal x time Interest rate = simple interest x 100% principal x time sELamAThARirAYa
11. Dividend and commission Dividend is the part of profit that is given by a company to its shareholders Commission is the amount of money earned for selling goods or services The rate of commission is the percentage earned by the seller of the total amount of goods or services sold Commission = rate of commission x total sales Rate of commission = commission x 100% total sales sELamAThARirAYa
