# In how many years

Let time = n years

P = Rs.1800

A = Rs.2178

R = 10% per annum

Now,

Amount (A) = P (1 + R/100)n [Where, A = Amount with compound interest

P = Present value

R = Annual interest rate

n = Time in years]

A = P (1 + R/100)n

2178 = 1800 (1 + 10/100)n

(1 + 1/10)n = 2178/1800

(11/10)n = 121/100

(11/10)n = (11/10)2

n = 2

Time = 2 years.

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