Question

Item 20 You have two loans, for 2 years each. The total interest for the two loans is $138. On the first loan, you pay 7.5% simple interest on a principal of $800. On the second loan, you pay 3% simple interest. What is the principal for the second loan?

Answer 1

Interest on first loan = 800*.075*2 = 120 
so the interest on the second loan 
= 138-120 = 18 

using the simple interest formula: 
18 = P*.03*2 
P = $300