Answer:
(in dollars)
Explanation:
As given,
Let a = total amount earned
Let h = hours worked in one week
Let b = number of cards sold in one week
Given is that Juan earns $6 an hour, means in total he earns =

He also gets a bonus of $5 each time he gets someone to sign up for the store's credit card, means he gets

So, total amount for the week will be = His weekly salary plus weekly bonus.
This becomes :
(in dollars)
We can check the equation by taking this example.
Lets assume that Juan woks 30 hours a week and sold 3 cards.
So, as per
amount becomes =

=

Thus the formula will be :
(in dollars)