The number of mobile phones sold of Company A during July is approximately what percent of the number of mobile phones sold of company A during December?

Number of mobile phones sold by A during July
$$\eqalign{ & = 45000\times\frac{17}{100}\times\frac{8}{15} \cr & = 4080 \cr} $$
Number of mobile phones sold by A during December
$$\eqalign{ & = 45000\times\frac{16}{100}\times\frac{7}{16} \cr & = 3150 \cr & \text{Let 4080 = }x\%\text{ of 3150} \cr & \text{Then,} \cr & \frac{x}{100}\times3150 = 4080 \cr & \Rightarrow x = \frac{4080\times2}{63} \cr & \Rightarrow x = 129.5 \cr & \Rightarrow x \approx 130 \cr & \text{Required percentage = 130%}\cr} $$