Please answer the following question by reasoning step-by-step.
Ursula bought five hot dogs at $1.50 each and three salads at $2.50 each. If she had two $10 bills, how much change did she get back?

5
Five hotdogs cost 5 x $1.

50 = $7.

50.

Three salads cost 3 x $2.

50 = $7.

50.

The total cost was $7.

50 + $7.

50 = $15.

And, Ursula had 2 x $10 = $20.

Therefore, Ursula got a change of $20 - $15 = $5.

.

The answer is 5