Mr.Tandon purchased a computer for ₹ 32,000 and a microwave oven for ₹ 6,500. On computer he lost 5% and on microwave he gained 15%. Find his total gain or loss per cent.(7th class math)

Mr.Tandon purchased a computer for 32,000 and a microwave oven for 6,500. On computer he lost 5% and on microwave he gained 15%. Find his total gain or loss per cent.(7th class math)

Solution:Given Cost price(C P) of Computer = Rs.32000
                                                           Loss % = 5%
                         Cost price(C P) of Oven = Rs.6500
                                                     Gain % = 15%
(1)Computer:
Loss (Computer) Rs. = 5 % of 32000
                                  = 5/100 X 32000
                                  = Rs.1600
then Selling price of Computer = (32000 - 1600)Rs.
                                                   = Rs.30400
(2)Oven:
Gain(Oven) Rs. = 15% of 6500
                          = 15/100 X 6500
                          = Rs.975
then Selling price of Oven = (6500 + 975) Rs.
                                           = Rs.7475
Total C P of (computer + oven) = Rs.32000 + Rs.6500
                                                   = Rs.38500
Total S P of (computer + oven) = Rs.30400 + Rs.7475
                                                   = Rs.37875
S P < C P ,then there is a loss.
Loss% = (C P - S P)/C P X 100
            = (38500 - 37875)/38500 X 100
            = 625/38500 X 100
            = 625/385
            = 1.62%
Therefore Loss 1.62%.

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