What is the cost estimated by the family on painting and flooring together?

Answer: Option B

Cost estimated on painting and flooring together
$$\begin{array}{rl}& =\text{Rs. }\frac{15+14}{100}\times 120000\\ & =\text{Rs. }\frac{29}{100}\times 120000\\ & =\text{Rs. 34800}\end{array}$$