Profit and loss

Alright, let's try to make a song that covers the core profit and loss formulas typically encountered in grade 9 mathematics. It's tricky to make it a perfect "song" in the musical sense, but I'll aim for a rhythmic and memorable recitation:

(Verse 1)

"Cost Price, Selling Price, the basics we must know,

To see if gains or losses, will start to freely flow.

If Selling Price is higher, a Profit we obtain,

But if it's lower, Loss is what will remain."

(Chorus)

"Profit equals, SP minus CP, it's true,

Loss equals, CP minus SP, for me and you.

Profit percent, Profit over CP, times one hundred, see?

Loss percent, Loss over CP, that's the key!"

(Verse 2)

"Marked Price, Discounts too, they play a vital part,

To calculate the final, selling price to start.

Discount amount, a percentage of the MP,

Subtract it from the MP, the SP you will see."

(Chorus)

"Profit equals, SP minus CP, it's true,

Loss equals, CP minus SP, for me and you.

Profit percent, Profit over CP, times one hundred, see?

Loss percent, Loss over CP, that's the key!"

(Bridge)

"Sometimes, we'll find, extra costs incurred,

Overheads added, the CP's then blurred.

Total cost, the sum of all, to get it right,

Then calculate the profit, in the light."

(Chorus)

"Profit equals, SP minus CP, it's true,

Loss equals, CP minus SP, for me and you.

Profit percent, Profit over CP, times one hundred, see?

Loss percent, Loss over CP, that's the key!"

Key formulas within the song:

* Profit: Profit = SP - CP

* Loss: Loss = CP - SP

* Profit Percentage: Profit\% = (Profit / CP) \times 100

* Loss Percentage: Loss\% = (Loss / CP) \times 100

* Discount Amount: Discount amount = (Discount Percentage/100) * Marked Price

* Selling price after discount: SP = Marked Price - Discount Amount.

Where:

* SP = Selling Price

* CP = Cost Price

* MP = Marked Price

I hope that helps.