The graph below represents number of bikes sold over a period of seven months. Observe the graph and answer the question that follows:

What is the approximate percentage increase in average sales between the period January to March and the period April to June?

Correct option is D

Solution:

Average sale from January to March = $$\frac{(200 + 300 + 100)}{3}$$​​

                                                            =  $$\frac{600}{3}$$​​

                                                             =  200

Average sales from April to June = $$\frac{(200 + 400 + 500)}{3}$$​​

                                                       = $$\frac{1100}{3}$$​​

                                                       =  366.66 or 366

Required percentage  = 

$$[\frac{(366 - 200)}{200}] × 100 = \frac{166}{200}× 100= 83\%$$​​

Then the approximate percentage increase in average sales between the period January to March and the period April to June is 83%