percentage question 2
2007-10-28 1:39 am
1) The marked price of a set of TV game was $2500. Its value raised by 8% every 2 months in the first year on the market. The value remained unchanged in the first half of the second year and dropped by 15% every 3 months thereafter. Find the value of this set of TV game at the end of the third year on the market, correct to the nearest dollar.
回答 (2)
2007-10-28 2:04 am
✔ 最佳答案
2500*1.08*1.08*1.08*1.08*1.08*1.08*0.85*0.85*0.85*0.85*0.85*0.85=1496
2007-10-28 2:00 am
the price of the TV set after the first year:
there are 12 months a year, the price will raise every 2 months, therefore it will raise 6 times over the year.
2500 x 1.08 (first 2 months)
2500 x 1.08 x 1.08 (4 months)
.
.
2500 x 1.08 x 1.08 x 1.08 x 1.08 x 1.08 x 1.08 = the price of the TV after the first year.
=3967.185807
= 3967.19( 2 dp)
the price remain unchange for the first half of second year and dropped by 15% every 3 months thereafter.
meaning from june of the second year to december of the third year the price dropped at 15% every 3 months.
it dropped 15 % every 3 months for 18 moths. meaninf it dropped 18/3 = 6 times.
3967.19 x 0.85 x 0.85 x 0.85 x0.85 x0.85 x0.85
= 1479.22
there are 12 months a year, the price will raise every 2 months, therefore it will raise 6 times over the year.
2500 x 1.08 (first 2 months)
2500 x 1.08 x 1.08 (4 months)
.
.
2500 x 1.08 x 1.08 x 1.08 x 1.08 x 1.08 x 1.08 = the price of the TV after the first year.
=3967.185807
= 3967.19( 2 dp)
the price remain unchange for the first half of second year and dropped by 15% every 3 months thereafter.
meaning from june of the second year to december of the third year the price dropped at 15% every 3 months.
it dropped 15 % every 3 months for 18 moths. meaninf it dropped 18/3 = 6 times.
3967.19 x 0.85 x 0.85 x 0.85 x0.85 x0.85 x0.85
= 1479.22
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