Lori owns a carsharing company. There are three red cars and two white cars available to rent. Renting the white car costs $2 for every minute and the red car $3 for every minute. All cars were rented for 3 hours. How much money did Lori earn?
Thoughts? Step-by-step reasoning:
Both white cars were rented for 2 * 2 = $4 for every minute. All three red cars were rented for 3 * 3 = $9 for every minute. So all Lori's cars were rented for 4 + 9 = $13 for every minute. Three hours are 180 minutes, so Lori earned 13 * 180 = $2340 for renting all the cars.
Thus, the answer is 2340.