Question

Q.11 Find the simple interest on Rs.7200 at 5% per annum for 8 months. Also
find the amount
Q.12 If the cost price of 6 pencils is equal to the selling price of 5 pencils. Find
the gain percent.
​

Answer 1

Answer:

question no one S.l is equal to2880 and amount is equal to 10080

Step-by-step explanation:

p=7200

R=5%

T=8

I=P*R*T ÷100=10080

Answer 2

The interest is Rs.240 and the amount is Rs.7440

The gain% is 20%

Step-by-step explanation:

A)

Principal = Rs.7200

Rate of interest = 5%

Time = 8 months =$\frac{8}{12} years$

$SI = \frac{P \times T \times R}{100}\\SI=\frac{7200 \times 5 \times 8}{1200}$

SI=240

Amount = Principal +Interest = 7200+240=7440

Hence The interest is Rs.240 and the amount is Rs.7440

B)

Let the CP of 1 pencil be Re.1

CP of 6 pencils = Rs.6

CP of 5 pencils = Rs.5

The cost price of 6 pencils is equal to the selling price of 5 pencils

SP of 5 pencils = CP of 6 pencils = Rs.6

$Gain\% = \frac{SP-CP}{CP} \times 100\\Gain\% = \frac{6-5}{5} \times 100\\Gain\% = 20\%$

Hence The gain% is 20%

#Learn more:

The cost of 5 pencil is equal to the selling price of 4 pencil. Find the gain percent

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