Read the following graph and answer the question :
Number of computers sold by dealers A, B, C and D in the years 2022 and 2023.

The average number of computers sold by dealers B and D in 2023 is what percent more than the average number of computers sold by dealers A, C and D in 2022 ?

Correct option is D

​$$\textbf{Given :} \\\ \, \\\text{2022 : } A = 350,\ B = 400,\ C = 380,\ D = 470 \\\ \, \\\text{2023 : } A = 450,\ B = 500,\ C = 550,\ D = 320 \\\ \, \\\textbf{Formula Used :} \\\ \, \\\text{Average} = \frac{\text{Sum of observations}}{\text{Number of observations}} \\\ \, \\\text{Percentage} = \frac{\text{Difference}}{\text{Original value}} \times 100 \\\ \, \\\textbf{Solution :} \\\ \, \\\text{Average of B and D in 2023} = \frac{500 + 320}{2} = 410 \\\ \, \\\text{Average of A, C and D in 2022} = \frac{350 + 380 + 470}{3} = 400 \\\ \, \\\text{Difference} = 410 - 400 = 10 \\\ \, \\\text{Required percentage} = \frac{10}{400} \times 100 = 2.5\% \\\ \, \\\textbf{Final Answer :} \\\ \, \\2.5\%$$​​