A TV and a computer have the same price. If the price of the TV goes up by 20% and that of the computer goes down by 10%, how much more will it cost be buy 4 TVs and 4 computer?

Explanation: ধরি, price x টাকা। TV এর price বাড়ার পর=\(x + x\) এর \(20\% = 1.2x\). Computer এর price কমার পর = \(x-x\) এর \(10\% = 0.9x\). পূর্বে 4 টি TV এবং 4 টি computer এর price =\(8x\). এখন 4 টি TV এবং 4 টি computer এর price = \(4 \times 1.2x + 4 \times 0.9x = 4.8x+3.6x = 8.4x\). So, percentage increase = \((8.4x-8x)/8x \times 100 = 0.4x/8x \times 100 = 5\%\). Answer (A)