A tape manufacturer reduces the price of his heavy duty tape from Rs.30/- to Rs.28/- a reel and the price of a regular tape from Rs.24/- to Rs.23/- a reel. A computing centre normally spends Rs.1440/- a month for tapes and 3/4 of this is for heavy duty tapes. How much will they save a month under the new prices?

2 Answers on this Question

1. More descriptive way :-
   The computer centre spends 3/4 of 1440 (ie,1080/-)for heavy duty tapes.
   That means they are spending 360/- (ie,1440-1080) for regular tapes.
   With 1080 Rs they can buy 36 units (ie,1080/30)
   With 360 Rs they can buy 15 units (ie,360/24)
   Again with the new prices :
   To buy 36 units : 36*28= 1008
   To buy 15 units : 15*23= 345
   Total=1353
   How much will they save a month under the new prices?
   Ans= 1440-1353 = 87

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2. 1440 * 3/4 = 1080
   1080 / 30 = 36
   1440 * 1/4 = 360
   360 / 24 = 15
   36 * 2 + 15 * 1 = 87

   Reply