What was the difference in the number of B type mobile produced in 2007 and 2008?

Answer: Option A

B types mobile production in 2007 = $$\frac{35\times 15}{100}$$
B type mobile production in 2008 = $$\frac{44\times 20}{100}$$
Required Difference
$$\begin{array}{rl}& =\frac{44\times 20}{100}-\frac{35\times 15}{100}\\ & =\frac{880}{100}-\frac{525}{100}\\ & =\frac{355}{100}\text{lakhs}\\ & =3,55,000\end{array}$$