Lucy spent $42 on food which was 14% of her weekly paycheck. To calculate her total paycheck, divide the amount spent on food by the percentage which is $42/0.14=$300. So Lucy deposited the remaining $300 - $42 = $258 into her savings account. To calculate the total cost of the gift if the down payment was 20% and cost $32, divide the down payment amount by the percentage to get the total. So $32/0.2=$160 is the total cost of the gift. Sally put $200 in the bank earning 5% interest each year. To calculate the interest earned over 3 years, take 5% of the original