Hello everyone

I am 24 years old and attending college and need some help. Here is the question:

You take up a short-term annuity of £ 60 000 The loan is repayable over three years in equal installments at the end of each quarter. Borrowing rate is 5% per year. We ignore other borrowing costs. What is the forward amount, and what is paid, respectively, as interest and abatement in the 2 quarter of the first year?

Here are the answers:

Forward Amount ( repayment) -Interest- abatement

1 quarter of Year 1: 5 415,50 - 750- 4 665.50

2 quarter of year 1: 5 415,50 - 691.68 4 723.82

have also tried this formula but I get the wrong answer:

60000x (1 + 0.05) ^ 4 x 0.05 / (1 + 0.05) ^ 3 to 1

1.2155x 0.05 / 1.2155-1

0.06077/0.2155 = 0.28199 x 60,000 = 16,919

What I do not understand is how they have solved it ^? can someone please please help me?