Answer:
18
Explanation:
You want the number of sandwiches Ellie sold if her cost price is £1.10, her selling price is £3.40, and she made £41.40 in profit.
Profit
The profit on each sandwich is the difference between selling price and cost. Ellie's total profit is the product of the number of sandwiches and the profit on each.
s(3.40 -1.10) = 41.40
s = 41.40/2.30 = 18
Ellie sold 18 sandwiches on Friday.
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