Financial Performance Prepayment months

Hi,

I am trying to work out the total of prepayment months on the below info, however I keep getting 11 months but the answer is 10... any help would be much appreciated!

Insurance Expenditure of £156,000, in respect of the period 1 May 20x1 - 30 April 20x2, was paid on 17 April 20x1.

Thanks!
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