# Engineering Maths - Percentage

>>>>>>>>Percentage

• A

Rs.8190  • B

Rs.9180  • C

Rs.6180  • D

Rs. 6900  • Option : B
• Explanation :

Interest on Rs.22500 = 0.1 x 22500 = 2250
Charges for managing the concern = 60 x 12 = 720
If yearly profit is x, then  B's share and A's share = (x/2)
∴(x/2)-2250 + 720
= (1/2)((x/2) -720 + 2250)
=> x = Rs. 9180.

• A

2700  • B

2800  • C

3200  • D

None of these  • Option : D
• Explanation :

Difference in % of votes = 57-43 = 14%
14% is represented by 420
Total number of votes = 420*(100/14)= 3,000

• A

Increase of 128 rats  • B

Decrease of 128 rats.  • C

Neither an increase nor a decrease in the population  • D

None of these  • Option : C
• Explanation :

Growth rate of rat population in 3 months = 20 *(3/12) = 5%
Increase in first 3 months = 3200 x 1.05 = 3360
Also, net decrease in 3 months = 160
Rat population = 3360 - 160 = 3200
In the same way, after every 3 months, rat population remains the same
Hence, even after 3 x 8 months i.e., 2 years, the population is maintained

• A

2.5%  • B

3%  • C

4%  • D

5.2%  • Option : C
• Explanation :

Let CP be Rs.x
SP = 1.2 x But he gets only 1.2x * 0.8 = 0.96x
Loss = 0.04x
Hence Loss % = 4.

• A

Rs.600  • B

Rs.572  • C

Rs.35  • D

Rs.605  • Option : B
• Explanation :

CP = Rs.550
∴ Marked price = 1.3x550 = Rs.715
∴ sales price = 0.8x715 = Rs.572.