The cost of a car is 400% greater than the cost of a bike. If there is an increase in the cost of the car is 15% and that of bike 20%. Then the total increase in the cost of the 5 cars and 10 bikes is:
Choose the most appropriate option:
A) 17.5%	B) 16(3/7)%	C) 18.5%	D) 18.25%	E) None
Solution: Let the bike's initial cost be X and then car's initial cost be 5X.   After the increase,   Bike price = 1.2X   Car price = 5.75X   Initial total cost of 5 cars and 10 bikes,   = 25X+10X = 35X   New cost,   25 +10= 
<gadget id="calculator">25 +10</gadget>
<output>35</output>
35X   New cost,= 28.75X+12x = 40.75X   Change in cost 28.75 +12= 
<gadget id="calculator">28.75 +12</gadget>
<output>40.75</output>
40.75X   Change in cost= (40.75X-35X) = 5.75X   % change (40.75 -35 )= 
<gadget id="calculator">(40.75 -35 )</gadget>
<output>5.75</output>
5.75X   % change= (5.75X*100)/35 = 16(3/7)%.   Answer: Option 16(3/7)%
<result>B</result>
The cost of a car is 400% greater than the cost of a bike. If there is an increase in the cost of the car is 15% and that of bike 20%. Then the total increase in the cost of the 5 cars and 10 bikes is: