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Vivek Kr Pandey

· started a discussion

· 1 Months ago

After ??? (Question:364700.0)

ये after कंफ्यूज कर रहा है । मै तो initial से time add कर रहा हूं । ये t year बाद से जोड रहे हैं ।

Question:

With a given rate of simple Interest, the ratio of Principal and Amount for a certain period of time is 4:5. After six years, with the same rate of interest, the ratio of the Principal and Amount becomes 5:7. The rate of interest is –

Options:
A)

5%

B)

2.5%

C)

4%

D)

10%

Solution:

Ans:(b) 


DINESH P

· commented

· 1 Months ago

right answer is 2.5

x = 4x.R.T/100 ie R.T=25

2x = 5x.R.(T+6)/100 ie R.(T+6)=40

by solving we get T=10 and R=2.5
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