If the fourth graders receive $10 of donation for each car they wash, to know the total earnings, we just need to multiply the value of the donation for each car by the total number of cars they washed.
As they washed 30 cars, and they earned $10 for each car, we multiply both values to know the total earning: 30*10 = $300
The question says that the fourth graders of Matthew Elementary school decided to embark washing cars so as to earn money, and if they all wash 30 cars in total and are paid $10 for each car washed.
Therefore,the total amount of cash earned for washing 10 cars will be:
