Question

pranav bought a DVD for Rs. 4000 on credit. The rate of interest for the First year is 5% and of the second year is 15%.Howmuch will it cost him if he pays the amount after two years.

Answer 1

GIVEN :-

» Cost of the DVD, = Rs 4000

» Rate of interest for 1st year, r1 = 5%

» Rate of interest for 2nd year, r2 = 15%

Here

=> P = Rs 4000,  

=> r1 = 5 and 

=> r2 = 15.

» If the rate of interest is r1% for the first year and r2 % for the second year, then 

=> A = P×(1+r1 /100).(1+r2/100)

=> A = 4000×(1+5/100).(1+15/100)

=> A = 4000×1.05×1.15

=> A = 4830
__________[ANSWER]

» Thus, the amount to be paid by Pranav after two years is Rs 4830.

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Answer 2

Heya!
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Given that :
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Principal P => 4000 Rs

R1 = 5%

R2 = 15%

Amount at the end of 2 years =>

$a = p(1 + \frac{r1}{100} )(1 + \frac{r2}{100} ) \\ \\ a = 4000(1 + \frac{5}{100} )(1 + \frac{15}{100} ) \\ \\ a = 4000(1.05)(1.15) \\ \\ a = 4000 \times 1.2075 \\ \\ a = > > 4830$


✔Hence the amount at the end of two years is Rs.4830



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