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Question

Question

Fly2high

PSLE Mathematics

Question post on Sun, 18/09/2016 5:04pm

Hi ,

pls help on this question.

thanks very much !

Fly2High

Source: Henry Park Primary

Answer

ChiefKiasu · Answer 1 · Post on Sun, 18/09/2016 5:28pm

a. Let X be the original price of the fan.

(0.8X + 0.5X) x 1.07 = $222.56

1.07(1.3X) = $222.56

X = $222.56/1.391 = $160

b. *Corrected*

Original price of 2 fans = 2 x $160 = $320

Discounted price of 2 fans before GST = $222.56/1.07 = $208

Overall discount = ($320 – $208) /$320 x 100 % = 35%

Fly2high · Answer 2 · Post on Sun, 18/09/2016 9:06pm

Thanks very much Chiefkiasu !

But the answer key says 35% is the answer for b.

Pls advise !

Thank u !

Fly2High

ChiefKiasu · Answer 3 · Post on Sun, 18/09/2016 9:27pm

ChiefKiasu Post on Sun, 18/09/2016 9:27pm

Is the answer for (a) in the answer key $160? Or something else?

Fly2high · Answer 4 · Post on Sun, 18/09/2016 10:15pm

Fly2high Post on Sun, 18/09/2016 10:15pm

Hi Chiefkiasu,

Answer for a) is 160 only .

Thanks

Fly2High

ChiefKiasu · Answer 5 · Post on Sun, 18/09/2016 10:20pm

Well, working backwards, if the original price of each fan is $160 and the overall discount is 35%, then the discounted price should be 65% of $320 which is $208, which does not match the $222.56 that Mr Tan paid.

BigDevil · Answer 6 · Post on Sun, 18/09/2016 11:00pm

$222.56 is the price AFTER GST.

The discounted price before GST is 222.56/1.07 = 208

(320 – 208)/320 x 100 = 35%

ChiefKiasu · Answer 7 · Post on Sun, 18/09/2016 11:17pm

Oh my goodness. I forgot about the gst completely! Thanks BigDevil for solving this mystery.

Fly2high · Answer 8 · Post on Mon, 19/09/2016 2:30pm

Fly2high Post on Mon, 19/09/2016 2:30pm

Thanks very much Chiefkiasu and BigDevil !!