A company offers three types of successive discounts i. 25% and 15% ii. 30% and 10% iii. 35% and 5% Which offer is the best for a customer ?

Answer: Option C

let the M.P. of an article be Rs. 100. We may calculate the final price of this article under each of the three offers:
i. Final Price = 85% of 75% of Rs. 100
$$\begin{array}{rl}& \text{ = Rs}\text{.}\left(\frac{85}{100}\times \frac{75}{100}\times 100\right)\\ & =\text{Rs}\text{. }63.75\end{array}$$

ii. Final price = 90% of 70% of Rs. 100
$$\begin{array}{rl}& =\text{ Rs}\text{.}\left(\frac{90}{100}\times \frac{70}{100}\times 100\right)\\ & =\text{Rs}\text{. }63\end{array}$$

iii. Final price = 95% of 65% of Rs. 100
$$\begin{array}{rl}& \text{ = Rs}\text{.}\left(\frac{95}{100}\times \frac{65}{100}\times 100\right)\\ & =\text{Rs}\text{. }61.75\end{array}$$
The final price is lowest in (iii). So, it is the best offer.