Rita and Meeta both are having lunch boxes of a cuboid shape. Length and breadth of Rita's lunch box are 10% more than that of Meeta's lunch box, but the depth of Rita's lunch box is 20% less than that of Meeta's lunch box. The ratio of the capacity of Rita's lunch box to that of Meeta's lunch box is :

Answer: Option C

let l, b and h denote the length, breadth and depth of Meeta's lunch box
Then, length of Rita's lunch box :
$$=110\%\text{ of }l=\frac{11l}{10}$$
Breadth of Rita's lunch box :
$$=110\%\text{ of }b=\frac{11b}{10}$$
Depth of Rita's lunch box :
$$=80\%\text{ of }h=\frac{4h}{5}$$
∴ Ratio of the capacities of Rita's and Meeta's lunch boxes :
$$\begin{array}{rl}& =\frac{11l}{10}\times \frac{11b}{10}\times \frac{4h}{5}:lbh\\ & =\frac{121}{125}:1\\ & =121:125\end{array}$$