a taxi driver earns $9 per 1 hour work. if he works 10 hours a day and in 1 hour he uses 2-liters petrol with price $1 for 1-liter. how much money does he earn in one day?
a. 90
b. 88
c. 70
d. 60
if he makes 9 an hour and works 10 hours a day, he makes 90 a day. every hour, he uses 2 liters of petrol, two dollars, so take two dollars off every hour. he makes 7 an hour. 7 times 10 is 70, or c.
