Answer:
$400
Explanation:
10 groups of 2 students so multiply 10 by 2 to get the total of how many students so if he gets $20 per student you will multiply the number of students by the rate which is $20 giving a total of $400
$400 per month
20 - per student
10 groups of 2,
so 20 students
20 * 20 = 400
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