If $\$16716$$16716 of simple interest was earned in $7$7 years, how much interest was earned each:

year?

month?

Calculate the simple interest earned on an investment of $\$2540$$2540 at $9%$9% p.a. for $2$2 years.

Give your answer to the nearest cent.

Calculate the simple interest on a loan of $\$8000$$8000 at $8%$8% p.a. for $6$6 years.

Give the answer to the nearest dollar.

Ned borrowed $\$3600$$3600 from a bank at a simple interest rate of $2.5%$2.5% for one year.