Do **you** understand that learning mathematics is NOT just memorizing formulas, it is *thinking*?

If the interest rate is 6%= 0.06, in one year amount A will earn 0.06A interest. In n years, it will earn 0.06An interest. Here, A= Php18450 and the interest is Php1340 so 0.06(18450)n= 1340.

0.06(18450)= 1107 so 1107n= 1340. Since n is multiplied by 1107 to get n by itself you need to divide both sides by 1107.