Final answer:
Ama's bank account will decrease by $17.50 after purchasing a $2.50 sandwich every day for 7 days.
Step-by-step explanation:
The question asks for the total change in Ama's bank account if she buys a bacon, egg and cheese sandwich for $2.50 each for 7 days. To find the total change, you multiply the cost of one sandwich by the number of days she buys the sandwich, which is 7 days.
To calculate: $2.50 per sandwich × 7 days = $17.50.
So, after 7 days, the total change in Ama's bank account will be a decrease of $17.50.