Smiling 哥 (towards his sprawling territory viewed from the corridor, arms outstretched)：我一定要追到你！
[Freeze screen]
*credits start running*
]]>追女仔 (chase girls) FAIL!
*clack clack clack clack clack ... *
]]>The Chinese New Year banter had long ceased. The silence was deafening. The tense minutes seemed like hours as the seconds ticked away.
The Maths Tutor's peer was intense, as she sized up the Ah Beng while he tossed the mandarin orange up and down with trembling fingers that betrayed his confident smile.
Just moments ago, beads of sweat were forming on his forehead as he approached with trepidation this Sec One percentages question which had caught out many of her students - mainly due to the absence of any given cost/selling price.
She wondered who this man was as, despite a near careless mistake that could be attributed to exam stress, he was somehow able to know that
Recognize that 100% always refers to the cost (original) price in profit and loss statements.
⇒ Overall % profit/loss = [(total selling price − total cost price)/total cost price] × 100% ----- (1)
Let the selling price be x since it's the common (and most convenient) unknown for both jars.
Hence total selling price = $2x.
20% profit for Jar 1
⇒ 120% of cost of Jar 1 = $x
⇒ Cost of Jar 1 =
20% loss for Jar 2
⇒ 80% of cost of Jar 2 = $x
⇒ Cost of Jar 2 =
∴ total cost price =
Sub the total selling price and total cost price in (1) to obtain the overall % as
(−ve sign ⇒ LOSS)
The standoff was finally broken by the Aunty ...
AIYOO! Smiling 哥 you are sooo smart! No wonder you and my Loi Loi are together!
I always knew that the pineapple tart seller has a secret crush on me!
... that was the cue for the maths tutor to bid everyone goodbye and leave the room abruptly.
*cue for 插曲 to play again*
]]>"No! No! No! Wait!"
"Since > $2x he made a net LOSS of .
So, using [loss / cost] x 100%, like this...
He made a 4% loss. Muahahahahha!!!
Now confirm correct already!"
With that, he pushed the paper back across the table, conveniently helped himself to a mandarin orange out of the basket on the table, and settled back down again, grinning confidently and 光明正大地盯着他心里的她。。。
]]>... ...
Sleeping memories of past mathematical endeavours awoken in his head.
He took out his pen and notepad and starting writing away, talking as he wrote, trying to emulate his 梦中情人.
"Let the selling price of each jar of pineapple tarts be $x.
Since he made a profit of 20% on Jar 1, $x is therefore 120% of the cost price of Jar 1. You know why? Because the cost price is 100%, and the profit is 20%, so the selling price is 100% + 20% = 120%, understand?
Cost price of Jar 1 = .
Since he made a loss of 20% on Jar 2, $x is therefore 80% of the cost price of Jar 2. You know why? Because the cost price is 100%, and the loss is 20%, so the selling price is 100% - 20% = 80%, understand?
Cost price of Jar 2 = .
Adding up the cost price of both jars we get
Adding up the selling price of both jars we get $2x.
Since > $2x he made a net profit of .
Miss Loi: *points to the statement above with trembling fingers* 你活得不耐烦了是吗?
Understand?
Now to find the percentage profit, you just have to use [profit / cost] times 100%. Like this,
(3s.f.).
Get it?
You have been cheated lah! Next year when you go CNY shopping, remember to call me along hor!"
He laughed a confidently evil laugh as he handed the scribbled workings to the auntie, then sat down and admired his 梦中情人 at close range...
]]>