i have y bars of chocolate at 42pence each write an expression in terms of y for the change in pence that i will get from a fiver
5.00 - .42y
To calculate the change you will get from a five-pound note, we need to find the total cost of the y bars of chocolate and subtract it from five pounds.
Each bar of chocolate costs 42 pence, so the total cost of y bars would be 42y pence.
Now, to find the change in pence, we need to subtract the cost of the chocolate from five pounds. Since one pound is equal to 100 pence, five pounds is equal to 500 pence.
Therefore, the expression in terms of y for the change in pence would be:
500 - 42y