Gita purchased 4 mobiles, 16 watches, and 8 tablets for

Solution

According to the question Let the cost price of each mobile, each watch, and each tablet be Rs. ‘v’ Selling price of each mobile = (320/4) = Rs. 80 Selling price of each watch = (960/16) = Rs. 60 According to the question, (80–v)/v×100=i…… (I) Also, (60–v)/v×100=j…… (II) Dividing equation (I) by (II), we get (80–v)/(60–v)=i/j Or, (80–v)/(60–v)=i/6i Or, 480v–6v=60–v Or, 5v=60 Or, v=10 Therefore, the cost price of all the tablets = Rs. 8v = Rs. 80 Required profit = 480 – 80 = Rs. 400