Michael started a savings account with $300. after 4 weeks, he had $350 dollars, after 9 weeks, he had $400. what is the rate of change of money in his savings account per week?

$12.50 per week

Step-by-step explanation:

See photos

Read first four weeks first

then read next four weeks

last read over eight weeks

well there are two answers for that.

1: you need 120 ones then that will equal up to 120.

2: you could also do one 100 and 2 tens.

those are the answers that i have thought of.