1 .	30 pens and 75 pencils altogether were purchased for ` 510. If the average price of a pencil was ` 2, what was the average price of a pen ?
[ A ]    ` 9 [ B ]    ` 10 [ C ]    ` 11 [ D ]    ` 12
Answer : Option D Explanation : Average the price of pencil = ` 2 The price of 30 pens and 75 pencils = ` 510 Let price of a pen = ` p So, 30 × p+ 75 × 2 = 510 30 p= 510 – 150 p= #360\over30$= 12 So, the price of a pen = ` 12
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