An investor purchased 150 shares of stock at $15.80 per share. The investor holds the stock for 39 weeks and then sells the stock for $19.25 per share. Use the commission schedule to find the annual rate of interest earned.

Principal	Commission
Under $2500	$25 + 1.6% of principal
$2500 - $7500	$38 + 1.1% of principal
Over $7500	$105 + 0.5% of principal

Cost: 150 * 15.80= $2,370

Commission: $2,370 * 0.016= 37.92 + 25.00= $62.92

Total Investment: 2370 + 62.92= $2,432.92

Cost: 150 * 19.25 = $2,887.50

Commission: $2887.50 * 0.011 = 31.76 + 38 = 69.76

Total Return: 2887.50 - 69.76 = $2817.74

A=P(1+r)^t A= 2817.74 P= 2432.92 t= (39 weeks / 52 weeks)= 3/4

2817.74=2432.92(1+r)^3/4