Question

Erik buys carrots and dip for a class snack. The carrots are $3.80, and the dip is$2.60. Erik has a coupon for 5% off his groceries. He does not need to pay tax. He gives the cashier $20 How much change does he receive back?

Answer 1

$3.80 + 2.60=$6.40 *.05=$5.08 

$20.00-$5.08=$14.92

Answer 2

3.80+2.60=6.40$ money that erik need to pay
6.40$ x .05=.32 (.05 represent the 5% coupon)
6.40$ - .32=6.08subtract the percent of the coupon to find the total bill of erik
20$ - 6.08=13.92$ subtract the money that erik needs to the 20$ 
13.92$ would be the change that erik receive back