on Ex5 the gross profit doesn't given on the question

how to calculate it in this case?

*I submit Ex4 just to get the concept

Exercise: 5 A fire occurred on 20 august 2014 in factory. From the following particulars ascertain the claim to be lodged with the insurance company. A fire insurance policy containing an average Clause was taken to cover the loss of stock by fire for S 7200. Stock on 1.1.2013 55400 Purchases during 2013 30000 Sales during 2013 50000 stock on 31.12.2013 9680 2 Wages during 2013 14600 wages during 2014 3000 Sales during 2014 purchases during 2014 13200 stock salvaged 20000 1000 Gross Profit 1.it was the practice of the firm to value stock at cost less 10% but this practice was changed and stock on 31.12.2013 valued at cost plus 10% 2 fire also broken out in 2013 destroyed the stock valued at 1800 Solution: Trading account for the year ending 31.12.2013 Particulars Amount Particulars Amount Opening 6000 Sales 50000 stockS400x100/90 Less returns Purchases 30000 Closing stock 8800 Less returns 9680x100/110 Wages 14600 Stock destroyed 1800 Gross profit 10000 (bal.fig) Total 60600 Total 60600 Gross profit %? Sales to gross profit 50000... 10000 10000 x 1 x 100/50000-20% 100 Particulars Opening stock Purchases Wages Gross profit Total Memorandum Trading account Amount Particulars Amount 8800 Sales 20000 13200 Less returns 3000 Closing stock 9000 4000 (bal.fig) 290000 Total 9000 Gross profit - 20000 x 20 /100-4000 Amount of stock destroyed Closing stock on the date of fire 9000 Less stock salvaged 1000 Stock destroyed 8000 Insurance claim = value of stock destroyed x value of insurance policy/value of stock on the date of fire = 8000 x 7200/9000 - 6400 Exercise 4 A fire occurred on 20 august 2014 in factory. From the following particulars ascertain the claim to be lodged with the insurance company. A fire insurance policy containing an average Clause was taken to cover the loss of stock by fire for S 36000. Stock on 1.1.2013 $ 27000 Purchases during 2013 150000 Sales during 2013 250000 stock on 31.12.2013 48400 Wages during 2013 73000 wages during 2014 15000 Sales during 2014 100000 purchases during 2014 66000 stock salvaged 5000 Gross profit for 2013 50000 1.it was the practice of the firm to value stock at cost less 10%, but this practice was changed and stock on 31.12.2013 valued at cost plus 10%. 2. fire also broken out in 2013 destroyed the stock valued at 9000. 17 Solution: Trading account for the year ending 31.12.2013 Particulars Amount Particulars Amount Opening 30000 Sales 250000 stock27000x100/90 Less returns Purchases 150000 Closing stock 48400x 100/110 44000 Less returns Stock destroyed 9000 Wages 73000 Gross profit 50000 (bal.fig) Total 303000 Total 303000 Gross profit %? Sales to gross profit 250000- 50000 100 -? 50000 x 100/250000=20% Memorandum Trading account 20 Aug 2014 Particulars Amount Particulars Amount Opening stock 44000 100000 Purchases 66000 Less returns Wages 15000 Closing stock 45000 Gross profit(100000*0.20) 20000 Total 145000 Total 145000 Gross profit = 100000 x 20/100 - 20000 Amount of stock destroyed Closing stock on the date of fire 45000 Less stock salvaged 5000 Stock destroyed 40000 Insurance claim = value of stock destroyed x value of insurance policy value of stock on The date of fire = 40000 x 36000/45000 = 32000 Sales