If the cost price of 10 greeting cards is equal to the selling price of 8 greeting cards find the gain or loss percentage.

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$Let space the space straight C. straight P space of space 1 space greeting space card space be space Rs.1 space space Therefore comma space space The space straight C. straight P space of space 10 space greeting space cards equals Rs.10 space space Given comma space space straight C. straight P space of space 10 space greeting space cards equals straight S. straight P space of space 8 space greeting space cards. So comma space straight S. straight P space of space 8 space greeting space cards equals Rs.10 Selling space Price space of space 1 space greeting space card equals Rs.10 over 8 equals Rs.1.25 Gain equals SP minus CP equals 1.25 minus 1 equals Rs space 0.25 Gain space percentage equals Gain over CP cross times 100 percent sign space space space space space space space space space space space space space space space space space space space space space space space space equals fraction numerator 0.25 over denominator 1 end fraction cross times 100 percent sign space space space space space space space space space space space space space space space space space space space space space space space space equals 25 percent sign Therefore comma space bold the bold space bold gain bold space bold percent bold space bold is bold space bold 25 bold percent sign bold.$

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