Example 6.31 A car rental firm has charges rupees 25 with 1.8 free kilometers, and rupees 12 for every
additional kilometer. Find the equation relating the cost y to the number of kilometers x. Also find
the cost to travel 15 kilometers
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y=20+(Total distance−1)12 [(Total distance-1), As 1
st
kilometer is charged at Rs.20]
y=20+(x−1)12
y=12x+8
when x=16, y=200
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