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This problem can be solved by using the formula I = PRT where, I is the interest, P is the principal amount, R is the rate, and T is the time.

The given in the problem are P = 800 I = 240 R = 6.5% or 0.065

What is asked in the problem is the time T We will now solve the problem by substituting the given to the formula I = PRT 240 = 800(0.065)(T) 240 = 52T 240/52 = 52T/52 4.62 = T T = 4.62 years

Therefore, it will take 4.62 years for 800 pesos to earn 240 pesos at 6.5% interest rate