Suppose in 1960, the consumer price index was 70 while in 2015 it is 280. What monthly salary in 2015 would have the same purchasing power as a monthly salary of 800 dollars in 1960?	Choose the correct choice from the following answers
A) 2100	B) 3200	C) 2030	D) 3000	E) None
Solution:   Let x be the monthly salary in 2015.   x/800 =280/70   x × 70 = 280 × 800   70x = 224000   70/70 x= 224000/70= 
<gadget id="calculator">224000/70</gadget>
<output>3_200</output>
3200   Answer 3200
<result>B</result>
Suppose in 1960, the consumer price index was 70 while in 2015 it is 280. What monthly salary in 2015 would have the same purchasing power as a monthly salary of 800 dollars in 1960?