The payment was for 18 months 1 Oct 2003 to 31 Mar 2005.
In the SOPL for the year to Dec 2004, we need the expense for those 12 months, which is therefore 12/18 x $60,000.
As at 31 Dec 2004 they have still overpaid for the period from 1 Jan 1005 to 31 March 2005, which is 3 months. Therefore in the SOFP there is a prepayment of 3/18 x 60,000.
Have you watched the free lectures on accruals and prepayments? The lectures are a complete free course for Paper F3 and cover everything needed to be able to pass the exam well.