Kurt's old refrigerator cost $0.85 a day in electricity. He recently bought a new energy-efficient refrigerator that only cost $0.45 a day in electricity. How much money does Kurt save in a 30-day month with his new refrigerator?
A step-by-step solution is:
12
The old refrigerator costs $0.

85 a day so for 30 days it costs.

85 * 30 = $25.

50.

The new refrigerator costs $0.

45 a day so for 30 days it costs.

45 * 30 = $13.

50.

Over 30 days, Kurt saves 25.

50 - 13.

50 = $12.

00 a month with his new refrigerator.

.

So, the answer is 12