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Question

Q29) Satya Prakash passed a certain bridge, which needs fee. There are 2 ways for him to choose. A : Rs130/month + Rs 2/time , B: Rs 7.50/time . He passes the bridge twice a day. How many days at least should he pass the bridge in a month, for it to be economic by A way?


A
(a) 11
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B
(b) 12
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C
(c) 13
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D
d) 14
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Solution

The correct option is B (b) 12
Ans:29)(b)
Sol:
Let x be the no. days where both are equal cost.
130 + 2*2x = 7.5*2x
130+4x =15x
130 =11x
x =11.81
By plugging in for 11 days
For A
130 +(11*2)*2=130+44=174
For B
22*7.5=165
By plugging in for 12 days
For A
130 +(12*2)*2=130+48=178
For B
24*7.5=180
Therefore answer is (b)

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