Comparing Quantities in our daily life

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Marks in Science = 40Marks in Maths = 38Marks in SST = 40
Percentage = 40+38+40/40X3 X 100
= 118/120 X 100= 98.3%
Marks in Science = 35Marks in Maths = 30Marks in SST = 40
Percentage =35+30+40/40X3 X 100
= 87.5%
= 105/120 X100
But Dad what is the Profit Percent of this laptop
Ok let me explain it to you.
we are selling our laptop for ₹30,000 and we had got it for ₹20,000
Profit = S.P - C.P= ₹30,000 - ₹20,000= ₹10,000
Cost Price of Laptop = ₹20,000Selling Price of Laptop = ₹30,000
Profit Percentage = P / C.P X 100= 10,000/20,000X 100= 50%
What Is your Question ?
Mom I have a Doubt can you please explain it to me ?
My question is that :Rahul bought a sweater and saved ` 200 when a discount of 25% was given. What was the price of the sweater before the discount?
25% of the original price = 200 Let the Price be P 25% of P = 25/100 X P= 200 P/4 = 200 P = 200 X 4= 800 Original Price of sweater is ₹800
jack do you know how to calculate interest ?let me give you an example
No Dad i don't know how to calculate the interest... ok dad

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