Homework Help: math

Posted by jessica on Sunday, January 13, 2013 at 1:55pm.

Zaineb is deciding whether to buy a stereo at $695 plus GST and PST now, or to invest the money to buy the stereo in a year. Her account pays 7.35% per annum, compounded monthly. If she can buy the stereo at the same price next year, how much would she save by the investing money?

the answer is $60.76, but I don't know ho they get it.. can someone explain to me..

math - GeorgeBass, Monday, January 21, 2013 at 12:46am
Cost of stereo: 695
gst + pst: 104.17 (15%)

total cost: 799.17

interest .0735 monthly over 1 year
is: 799.17 x 1.006125^12 = 859.93

Saving is 859.93 - 799.17 = 60.76

Having the answer allowed me to calculate gst + pst. I assume it must
not be included in the cost.

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