Respuesta :

CarpeDiem2255

Answer: $20.30

Step-by-step explanation:

First we must find Mary's total.

3kg × $9.90/kg = $29.70

She gave the cashier $50. So we subtract the total from that to determine the amount of cash or change she should get back.

$50 - $29.70 = $20.30

theirvoice945

$20.30

Step-by-step explanation:

1kg=9.90

3kg=x

X=9.90×3

X=$29.70

Change=$50-$29.70

=$20.30