ACCA FR Chapter 15 Income taxes (IAS 12) Question 5 from online test

hello Here is the question: Prude plc's trial balance as at 31 December, 2014 showed balances brought forward from last year on both the Current Tax account and the Deferred Tax account. The liability of $3,000 brought forward on the Deferred Tax account was increased to $4,500 at the end of the year due in part to the deferred tax implications arising from the revaluation of some of Prude plc's properties. The property had been revalued by $3,200. Prude plc's accounts department had calculated the tax liability based on this year's profits at the rate of 25% to be $4,600 and $1,500 tax had been paid to the State Revenue Service during the year The tax charge in the statement of profit or loss was shown as $7,700 What was the balance brought forward from 2013 on the Current Tax account? Here is the answer: Incorrect deferred tax debits: 4,500(ok) deferred tax credits: 3,000(ok); 800; 700 current tax debits: 700; 4,600(ok); 1,500(ok) current tax credits: 7,700 therefore balance brought forward on Current Tax account is $900 debit I have drawn the T accounts for current tax and deferred tax and plugged in numbers from the information but not for all.There are some numbers i can understand how to deal with them. How should i deal with this? The property had been revalued by $3,200. Also help me with this: The tax charge in the statement of profit or loss was shown as $7,700. Isn't the tax charge a combination of the balancing figures we get from the both the current tax account and the deferred tax account? How come in the answer, the amount of 7700 was credited the the current tax account.