Hector just bought a new laptop for $780. He earned the $780 by selling lemonade, mowing lawns, and
returning tin cans. He earned 40% of the money he used to buy the laptop from lemonade sales, and $180
from the tin cans. How much money did he make mowing lawns?

Step-by-step explanation:

40% of 780 = 312.

780- (312+180)

= 288

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