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19 പേന വാങ്ങിയാൽ ഒരു പേന വെറുതെ ലഭിക്കും. എന്നാൽ കിഴിവ് എത്ര ശതമാനമാണ് ?

A20%

B15%

C10%

D5%

Answer:

D. 5%

Read Explanation:

discount%=discounttotal×100=119+1×100=120×100=5%\text{discount} \% = \frac{discount}{total}\times 100 = \frac{1}{\text{19+1}}\times100 = \frac{1}{20}\times 100 = 5\%


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