Simple Interest

What is the simple interest on a loan of $15,000 borrowed at a rate of 10% for two years?

A bank is offering loans at an interest rate of 5% per year. John, a local farmer, decides to take a loan of $5,000 and agrees to pay the loan within 2 years.How much interest will John pay when repaying the bank?

What does the "P" in the simple interest stands for?

If Mary borrowed $10,000 from the People's Bank, at a rate of 10% and had to pay back an interest of $2,000 how much time (years) did it took Mary to repay the loan?

What does the "R" in the simple interest formula mean?

If it took Thomas 5 years to pay a loan of $2,000 with an interest of $4,000;what was the rate of interest that Tom agreed to?