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Standard VII

Mathematics

Time and Work

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Question

Working for $10$ months as a teacher in High School, David earned $$ 3, 200$ per month from September to June. He then undertook a job as a barista at a cafe, where he earned $$ 2, 000$ per month during July and August. Find the average monthly pay of David for the $12$ months.

$ 2400

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$ 2500

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$ 2600

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$ 2800

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$ 3000

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Solution

The correct option is D $$ 3000$
David earned $$ 3200$ per month in High school
So in $10$ months he earned $=$ $10 \times 3200 =$ 32000$
David earned $$ 2000$ per month in cafe
So in $2$ month (july,august) he earned $=$ $2 \times 2000 =$ 4000$
His total earning $=$ $32000 + 4000 = 36000$
$∴$ Average monthly pay $= \frac{36000}{12} =$ 3000$

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Working for 10 months as a teacher in High School, David earned $3,200 per month from September to June. He then undertook a job as a barista at a cafe, where he earned $2,000 per month during July and August. Find the average monthly pay of David for the 12 months.

The correct option is D $3000David earned $3200 per month in High schoolSo in 10 months he earned = 10×3200=32000$David earned $2000 per month in cafeSo in 2 month (july,august) he earned = 2×2000=4000$His total earning = 32000+4000=36000∴ Average monthly pay =3600012=3000$

Working for $10$ months as a teacher in High School, David earned $$ 3, 200$ per month from September to June. He then undertook a job as a barista at a cafe, where he earned $$ 2, 000$ per month during July and August. Find the average monthly pay of David for the $12$ months.