TeaBoh:

Panda168:

[quote=\"TeaBoh\"]June bought a book at $32.10 inclusive of GST 7%.

She was given a 20% discount before the GST and the shopkeeper still earned a profit of 20%.
Calculate the profit the shopkeeper would have earned before the discount.

Can someone help?
TIA

Let the price before GST as $x
(107/100) * $x = $32.10
x = (100/107) x 32.10
=$30

Let the price before discount as $y
(80/100) x $y = 30
y = (100/80) x $30
= $37.50

Let the price before profit be $k
(120/100) x $k = 37.50
k = (100/120) x 37.50
= $31.25

Therefore profit before discount = $37.50 - $31.25
=$6.25

Hi Panda168

Thank you for your help.
But the answer given is not $6.25.[/quote]Can I know the answer? Is it $12.50?

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ttlkbs:

Pls help :


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SOS mum:

Hi, ps help. Many tks and God Bless:)


1) In 2 hours, the distance travelled by a car is 30km more than a bus. If they can travel 135km in 1 hour, find their speeds.

2) I think of a two-digit number. The sum of the digits is 13. When I reverse the digits of the number, I get another number whose value is 9 more than the first number. What is the number I thought of? (Must use simultaneous Linear Equations)

1) Assuming the distance are travel in constant speed. Therefore in 1 hr, the car will travel 15km more than the bus. Let the distance travel by the bus in 1 hr be x km. Than distance travel by car in 1 hr is (x+15) km

135 = x + x + 15
2x = 120
x = 60 km

Therefore the speed of the bus is 60 km/h and the speed of the car is 75 km/h.

TeaBoh:

June bought a book at $32.10 inclusive of GST 7%.

She was given a 20% discount before the GST and the shopkeeper still earned a profit of 20%.
Calculate the profit the shopkeeper would have earned before the discount.

Can someone help?
TIA

Let the price before GST as $x
(107/100) * $x = $32.10
x = (100/107) x 32.10
=$30

Let the price before discount as $y
(80/100) x $y = 30
y = (100/80) x $30
= $37.50

Let the price before profit be $k
(120/100) x $k = 37.50
k = (100/120) x 37.50
= $31.25

Therefore profit before discount = $37.50 - $31.25
=$6.25

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Volcano123:

Can someone help me with this question? Thanks

I have difficulty getting the 2 values of x for (ii). Can help.
Ans (ii) x= 0 or 5

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Thank you

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KSP2013777:

Can help me do this?


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Tks

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KSP2013777:

Thanks, panda 168. I have one more I can't do. Can u please help?


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Thanks.

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KSP2013777:

How do you do this question? Can someone pls help.


Without using a calculator, evaluate the following:
Sin^2 67.5⁰ (the number 2 is the exponent -- I dunno how to show it)

Trigonometry is difficult.

TIA

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ebabe:

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Panda168:

KSP2013777:

Anyone can help me?


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Thanks

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