if a trader earns a profit of 20% by selling an item for rs 390 find c.p || unitary method ||

The Cost Price (CP) is the price at which an item is purchased before any profit or loss. The formula depends on the given information.
Sp - profit = cp
A percentage is a way of expressing a number as a fraction of 100. It is widely used to compare proportions, show relative changes, or measure rates. The term "percent" comes from the Latin phrase per centum, meaning "by the hundred."
Key Features of Percentage:
1. Symbol: Represented by the "%" symbol.
Example: 50% means 50 out of 100 or .
2. Mathematical Expression:
To convert a fraction or decimal to a percentage: Multiply by 100.
Example: .
To convert a percentage to a decimal: Divide by 100.
Example: .
3. Formula: Percentage can be calculated using the formula:
\text{Percentage} = \left(\frac{\text{Part}}{\text{Whole}}
ight) \times 100
Shivanand Sharma
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