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"\\( \\begin{aligned} \\text { mount of change } = & \\text { decrease in the number of illiterate persons } = 150 - 1 \\\\ \\text { herefore, the percentage of decrease } \\\\ = & \\frac { \\text { amount of change } } { \\text { original amount } } 100 = \\frac { 50 } { 150 } \\times 10 \\\\ \\text { Find Percentage of increase or decrease: } \\\\ \\text { - Price of shirt decreased from R } s 80 \\text { toRs } 60 . \\end{aligned} \\)"

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