If the simple interest on $7,000 for 33 years is $840, then what is the interest rate? the rate is _%

R = 0.3636%/year

Equation:
r = (1/t)(A/P - 1)
Calculation:
Solving our equation:
r = (1/33)((7840/7000) - 1) = 0.00363636
r = 0.00363636

Converting r decimal to R a percentage
R = 0.00363636 * 100 = 0.3636%/year

The interest rate required to get a total amount, principal plus interest, of $7,840.00 from simple interest on a principal of $7,000.00 over 33 years is 0.3636% per year.

The answer would be 27 because assuming that each package has 1 bar of soap and 1 tube of toothpaste, after 27 packages they would run out of toothpaste