Arectangle has a length of 3.6 in. and a perimeter of 16.8 in. enter the width of the rectangle, in decimal form, in the box.

If the rectangle has a length of 3.6 inches, and a perimeter of 16.8 inches, the width will be 4.8, which we can work out by taking away the amount we already know from the perimeter, which will of course be 3.6 x 2 (7.2) to get 9.6. This is the combined length of the remaining widths within the perimeter added together, so to find the width along, you simply need need to halve 9.6 to get 4.8.

Total monthly payments: 10*$34 = $340.

Credit amount: $320 - $20 = $300

Interests : $340 - $300 = $40

interest rate: interest*100/ credit = 40/300*100 = 13.33%

yearly interest rate = (interest rate / number of months)*12 = 13.33%*12/10=16%