Posted by **arzam** on Saturday, November 9, 2013 at 2:52am.

A television costs 270.25 dollars including 15% tax. How much of the cost is tax?

- maths -
**Steve**, Saturday, November 9, 2013 at 5:18am
270.25(1 - 1/1.15) = 35.25

- maths -
**arzam**, Saturday, November 9, 2013 at 11:25am
But where does the (1-1) from (1-1/1.15) come from?

- maths -
**Steve**, Saturday, November 9, 2013 at 11:41am
1.15p = 270.25

p = 270.25/1.15 = 235

270.25-235 = 35.25

so,

35.25 = 270.25 - 270.25/1.15 = 270.25(1-1/1.5)

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