Answer:
$40 per week
Step-by-step explanation:
Step one:
Given data
the initial amount is = $100
the total amount= $500
let the number of weeks be x
Step two:
The expression for the scenario is
[tex]500= 100+40x-------1[/tex]
From the expression above, the rate of the change is $40 per week.
this means that in every week the account will be increased by $40