
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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July 21st, 2019, 09:01 AM  #1 
Senior Member Joined: Aug 2014 From: India Posts: 458 Thanks: 1  How 44/100 in third step?
Giri invested Rs X in scheme I for 3 yrs at the rate of 12% per annum at S.I while also invested Rs (X+4000) in scheme II for 2 yrs on C.I at 20% per annum rate. Find the total sum invested by Giri if total interest earned by him is Rs 3360. Sol: X â†’ 12% â†’ 3 â€“ S.I X + 4000 â†’ 20% â†’ 2 â€“ C.I 36/100X + 44/100(X + 4000) = 3360 X = 2000 I know C.I = P(1+ R/100)^n. 
July 21st, 2019, 10:38 AM  #2  
Senior Member Joined: Jun 2019 From: USA Posts: 120 Thanks: 40  Quote:
Quote:
(If compounded once per year.) I1 + I2 = 0.36 X + 0.44 X = 0.80 X = Rs 3360 X = (Rs 3360) / 0.80 = (5/4)*(Rs 3360) = Rs 4200 Like I said, don't focus on how the solution did it. They are skipping some steps they assume to be obvious. Focus on solving it yourself using what you know.  

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