Question

The total interest earned after one year when Php 100 000 is invested, part of 6% annual interest
rate and the remaining part at 7.5% annual interest rate

Answer 1

Answer:

x = amount of money invested at 6%

y = amount of money invested at 7.5%

x+y = 100,000

y = 100,000 - x

Interest Earned for the 6% account = 0.06x

Interest Earned for the 7.5% account = 0.075y = 0.075(100,000 - x) = 7500 - 0.075x

Add up the amounts:

0.06x+0.075x = 0.135x

So we can get as far as 0.135x. We can't go any further unless we know either x or y.