The cost of a pen is 20% more than that of a book and the cost of a CD is 3/4 as much the cost of the pen. If the cost of the pen is TK. 90 more than that of the CD, what the cost of the book in taka?
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Answer:
cost of book= x
cost of pen=1,20x=90+0,90x
cost of CD=3/4(1,20x)=0.90x
1,20x=90+0.90x
1,20x-0,90x=90
0,30x=90
x=90/0,30- 300 taka ( cost of book)
answer
Check:
cost of pen=20% more than the cost of
book 0,20(300)+300=60+300=360 or
=
1,20(300)=360
cost of pen=90+3/4(cost of
pen)=90+3/4(360)=90+270=360 which
is 90 more than that of CD,
cost of CD=3/4 as much as the cost of
pen =3/4(360)= 270 or 0.90x, because
3/4 of 1,20x=0.90 x=0,90(300)=270 Ok
percentage = 360/270 x100 = 4/3 x 10
=40/3 =13.33° %
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