The expression is f(y) = 80y.
We have a school canteen.
We have to write down an expression for the cost in pence of y cups of tea.
A function in mathematics is a relation involving two variables, such that one variable is dependent on the other for its value.
According to the question -
Number of cups of tea = y
Cost of one cup = 80 pence.
Therefore, the function representing the cost in pence of y cups of tea =
f(y) = 80y
Hence, the expression is 80y.
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