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A student of class 10 saves Rs 4 on day one Rs 7 on day two Rs 10 on day three.and so on. How much amount will the student save in month of February 2011?
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A student of class 10 saves Rs 4 on day one Rs 7 on day two Rs 10 on d...
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A student of class 10 saves Rs 4 on day one Rs 7 on day two Rs 10 on d...
It is Feb 2011 therefore no. of days=28
he starts on Feb 1
ap: 4,7,10.....
a=4,d=7-4=3,n=28
to find: amount saved in 28 days
soln: Sn=n/2 (2a+(n-1)d)
S28= 28/2 (2×4+(28-1)3)
S28= 14 (8+81)
S28= 14×89=1246
therefore he will save Rs 1246 in the month of Feb 2011
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A student of class 10 saves Rs 4 on day one Rs 7 on day two Rs 10 on day three.and so on. How much amount will the student save in month of February 2011?
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