40. In how many years will Rs. 2000 amount to Rs. 2420 at 10% per annum compound interest ? / कितने वर्षों में रु. 2000 राशि से रु. 2420 प्रति वर्ष 10% चक्रवृद्धि ब्याज पर?
3 years
2 years
5 / 2 years
3 / 2 years
Answer / उत्तर -2 years
explanation / स्पष्टीकरण :-
Amount = P[1 + (R/100)]
Calculation:
2420 = 2000[1 + (10/100)]
⇒ (11/10) = 121/100
⇒ (11/10) = (11/10)
⇒ T = 2 years
explanation / स्पष्टीकरण :-
Amount = P[1 + (R/100)]
Calculation:
2420 = 2000[1 + (10/100)]
⇒ (11/10) = 121/100
⇒ (11/10) = (11/10)
⇒ T = 2 years
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