Question

a men sell a calculator at the rate of 250each which include a profit of 14%.what amount of profit will he earn in 7 days

Answer 1

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Since, it is not mentioned how many calculators are sold per day hence we will assume that one calculator is being sold per day.

Selling Price ( SP ) of 1 calculator = ₹ 250

Profit percentage = 14 %

Let the Cost Price ( CP ) be ₹ ' x ' .

Profit = ₹ ( 250 - x )
Profit percentage = ( 250 - x ) / x * 100
14 = ( 250 - x ) / x * 100
14x = 100 ( 250 - x )
14x = 25000 - 100x
114x = 25000
x = ₹ 25000 / 114
CP = x = ₹ 25000/114

Profit = 250 - 25000/114
Profit = ₹ 3500 / 114

Profit in 7 days = 3500 / 114 * 7
Profit in 7 days = 214.91 ( approximately )

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Answer 2

Here is your solution

it is not Given in question  how many calculators are sold per day.

So  we will assume that one calculator is being sold per day.

S.p of 1 calculator = ₹ 250(given)

Profit percentage = 14 %(given)

Let,

The C.p be  ₹ x

Profit = [₹ 250-x]

Profit percentage =[250 - x]/ x×100

NOW

14 = ( 250 - x ) / x × 100

14x = 100 ( 250 - x )

14x = 25000 - 100x

114x = 25000

x = 25000 / 114

given that  CP =x

CP = x = ₹ 25000/114

Profit = [₹ 250-x]

Profit = 250 - 25000/114

Profit = ₹ 3500 / 114

Profit in 7 days

= 3500 / 114×7

Profit in 7 days =214.91(Aprox)

NOTE :-we can  assume  1 or 2 or etc  calculator is being sold per day.but answer will come other other.

Hope it helps you