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1.  The cumulative bar chart below gives us the production of four Products A, B, C and D for four years. It is known that the total production increases @20% over its value in the previous year. The difference between C's production in 2003 and A's production in 2001 is 2640 units.

Production of A, B, C and D.
Bar Chart  direction image

Assuming no pile up of inventory at the beginning or the end of the year, what is the ratio of the number of units of C produced in these four years?

Solution:
Assume the total production of the first year as 10000, second year becomes 12000, third year 14400 and fourth year 17280.
Then,
0.2 × 17280 - 0.2 × 12000 = 1056
But this difference is given as 2640. Hence, the value of production will be; 25000, 30000, 36000, and 43200 respectively for the 4 years.
Ratio of the number of units C produced in four year,
= 0.2 × 25000 : 0.2 × 30000 : 0.2 × 36000 : 0.2 × 43200
= 250 : 300 : 360 : 432
= 175 : 150 : 180 : 216

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