Question

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Answer 1

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Answer 2

CP of 15 pen=SP Of 20 pen. Let the SP of 1 pen be Rs1. So CP of 15 pen =Rs 20

CP of 1 pen = (20/15) =4/3=1.33

loss=(cp—sp) /cp = (1.33–1)/1.33=0.25

Loss%=0.25*100=25%

Matter is anything that occupies space and has mass.