how to do interest in math

Mr. Justin gives a loan of $2500 to his uncle. He charges 6.5% interest each year. His uncle pays him back in 2 1 / 2 years. How much simple interest does his uncle pay? => $506.25 or $456.25 or $406.25 or $396.25..

Laura borrowed $600 for 2 years at 5% interest compounded annually from Victor. What is the interest paid by Laura to Victor? => $80 or $100 or $60 or $40..

The simple interest on a principal of $300 at an interest rate of 5% is $45. For how many years is the simple interest calculated? => 3 or 6 or 5 or 4..

Find the simple interest earned on $2800 deposited in a bank at 2% annual interest after 5 years. => $270 or $280 or $230 or $305..

Find the interest obtained on an investment of $3000 at 8% interest compounded annually for 4 years. => $1081 or $1291 or $968 or $1201..

Find the simple interest on a principal of $140 for a period of 4 years at an interest rate of 3%. => $15.80 or $16.80 or $17.80 or $18.80..

Edward invested part of his savings at 2% simple interest per annum and half this amount at 4% simple interest per annum. He wants to earn a total annual interest of at most $200. Write an equation or an inequality to find the greatest possible amount Edward invested a..

Andrew invested $1800 in two parts, one at 14% interest and the other at 8% interest. His total income in one year was $240. How much did he invest at each rate? => 960, 1920 or 1600, 200 or 1550, 250 or 685.71, 200..

Jim gave a loan of $4200 to his uncle. He charges 8.2% interest each year. His uncle pays him back in 4.5 years. How much simple interest does his uncle pay? => $1649.8 or $1539.8 or $1599.8 or $1549.8..

Lydia borrowed $600 for 2 years at 5% interest compounded annually from Charles. What was the interest paid by Lydia to Charles? => $40 or $80 or $60 or $100..