The amount of interest earned on an investment is directly proportional to the amount of money invested. If 200, 000 pesos earns 15, 000 in a month, how much will a 150, 000 peso investment on the same venture earn in a year?

Answer 1

15/200 = x/150

or, since 150 is 3/4 of 200, it will earn 3/4 as much interest.

watch out for the time intervals...