Question 516249
A teacher has a choice of two investment plans: an insured fund that has an average of 11% interest per year, or a riskier investment that has an average 13% return. If the same amount invested at the higher rate would generate an extra $100 per year, how much does the teacher have to invest?

13%x-11%x=100
multiply by 100

13x-11x=100*100
2x=10,000
x=5000