Question

The bill was $14.00. She left a 20% tip for the waitress. How much change did she get back from $20.00

Answer 1

20%=0.2
14*0.2 = 2.8 ( $2.80 is the tip she will be giving her)
$14+$2.80 = $16.80 ( what she will be giving in total) 
$20-$16.80 = $3.20 (the change she will get back)