Number of Dell laptops sold by store T is what percent more than the number of laptops sold by store P?

Number of Dell laptops sold by store T is what percent more than the number of laptops sold by store P? Correct Answer 40%

Number of Dell laptops sold by store T
$$\eqalign{& = 2400\times\frac{21}{100} \cr& = 504 \cr} $$
Number of Laptops sold by store P
$$\eqalign{& = 2400\times \frac{15}{100} \cr& = 360 \cr} $$
Required Percentage
$$\eqalign{& = \frac{504-360}{360}\times100 \cr& = 40\% \cr} $$
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