RRB Paramedical Staff Nurse Model Paper 6

Question : 42 of 100

Marks: +1, -0

John invested a sum of money at an annual simple interest rate of 10%. At the end of 4 yr, the amount invested plus interest earned was Rs. 770.The amount invested was

₹ 650
₹ 350
₹ 550
₹ 500

Validate

Solution:

Given

r=10%

t=4,A=770
Let the principal be Rs

x

, then
Simple Interest = Amount- Principal

=\Rs(770-x)

Thus

\SI=\;{\Principal ×\Rate×\Time }/{100}

Principal

=\;{SI × 100}/{\Time×Rate}

⇒ \;\; x=\;{(770-x) × 100}/{4 × 10}

⇒ \;\; 2 x=(770-x) × 5

⇒ \;\; 2 x+5 x=770 × 5

⇒ 7 x=770 × 5

⇒x=\;{770 × 5}/{7}=\Rs 550

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