Work out the balance for £1500 invested for 4 years at 5.4% per annum

Estimated - 1851.2. Basically multiply the original number (1500) by 5.4; 4 times. Make sure every multiplication involves the new number rather than using 1500 every time. e. g. if 10% more of 100 is 110. Then 10% more of 110 is 121