Find 15 percent of 15 percent of 15 percent of 500 how does this compare to finding 45 percent of 500?

Completely different...

.15*.15*.15*500

500(.15^3)=1.6875

500(.45)=225

On monday,mrs.wise bought 3 lbs of apples at $4per lb= 4*3=$12on tuesday ,20%off and she buy 5 lbs of apples = $4-20%=3.20*5lb=$16example: other wise when she buy 5lbs on monday she have to spend 4*5=20

Ibelieve that c. recording would work best.