The opening stock valued in the books at Rs. 99,000 is understated by 10%, while the closing stock valued at Rs. 96,000 is understated by 20%. In this case, the profit will be

Understated opening stock by 10% i.e. correct value is 99000* 100/90 = Rs.1,10,000. Thus, profit is overstated by Rs.11,000 as expenses are shown with less amount. Accordingly, the actual value of closing stock is 96,000* 100/80 = Rs.1,20,000 i.e. profit is understated by Rs. 24,000. Thus, overall profits are understated with Rs.13,000. All other options will give incorrect answers.