Math solving and showing!

40=20% of what number???

How I solved it:  40 is 20% of ____?  .20/40= 200!!!!!!!

story problem: Sarah went to the store and bought 200 apples. Her friend Cathy wanted 20 percent of her apples. How many apples will Cathy get?=40!!!

81/2% of $500.00=____?

How I solved it: 8 1/2%= .085.  500 x .085= $42.5!!!

story problem: Joe goes to Ikea and looks for a couch to buy. He finds a good one and the original price is $500 dollars the couch is 8 1/2% off. How much money is Joe saving. He is saving $42.5!!!

18= ___% of 150?

How I solved it:  18/150= 12%!!!

Shirley looks for a hat. The hat is 18 dollars. She sees other hats that are $150. What percent of 150 is 18? The answer is 12%!!!