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It costs Rs. $10$ per km to fly and Rs. $2$ per km to drive. If one travels $200$ km covering $x$ km of the distance by flying and the rest by driving, then what will be the cost of the trip?

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Rs.

2, 000

Rs.

24, 000

Rs.

(8 x + 400)

Rs.

(12 x + 400)

answer is C.

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Detailed Solution

Given,

x

km is the distance travelled by flying.
Then, the distance travelled by driving

= (200 - x)

km.
Cost of flying

=

Rs.

10

per km.
Cost of flying

x

= 10 \times x = Rs . 10 x

.
Cost of driving

=

Rs.

2

per km
Cost of driving

(200 - x)

= 2 \times (200 - x) = Rs . 400 - 2 x

Total cost

= 10 x + 400 - 2 x

\Rightarrow Rs . 8 x + 400

Hence, the correct option is 3.

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