Apples cost 25p each. Bananas cost 20p each. The total cost of a a\,a apples and b b\,b bananas is CCC.
Write a formula for the total cost of a a\,a apples and b b\,b bananas.
Hence, find the total cost when a=8a = 8a=8 and b=13b = 13b=13.
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