Calculating the percentage of loan interest

I am stuck here.
The question has this information
In the Trial Balance as at 30/06/x7 I have the loan amount of 10,000 and Loan interest paid of 300.

In the additional information it says Loan taken out on 1/7/x6

The solution page gives the following
Charge for the year 10,000×6% = 600
Amount paid as per trial balance = 300
Accrual required = 300

Hence finance costs have been considered as 600 and interest accrual as 300

I don’t understand how the 6% is calculated??