Question

The cost of an article is first decreased by 25% and then further decreased by 40%. Find the percentage change in the cost of the article.

Answer 1

Let the original cost = Rs. 100
Increased by 25%
$\therefore$ New cost = 100-25 = Rs. 75
Decreased by 40% = $\frac{75\times 40}{100}$ = Rs.30
$\therefore$ New cost = 75- 30 = Rs. 45
Overall change = 100-84 = Rs. 16
Required percentage = $\frac{55}{100}\times 100$ = 55% decrease