Coaching Centre
Percentage change, profit and loss
Calculating percentage change, profit and loss, and percentage profit or loss based on the cost price.
Percentage change
A rent rises from $\$400$ to $\$430$ a week. Find the percentage increase.
Profit and loss
A phone bought for $\$650$ is sold for $\$520$. Find the percentage loss.
Rent rises from $\$400$ to $\$430$. Percentage increase? (number only)
$\tfrac{30}{400} \times 100$.
Bought for $\$650$, sold for $\$520$. Percentage loss? (number only)
$\tfrac{130}{650} \times 100$.
Bought for $\$80$, sold for $\$100$. Percentage profit? (number only)
$\tfrac{20}{80} \times 100$.
A price drops from $\$50$ to $\$30$. Percentage decrease? (number only)
$\tfrac{20}{50} \times 100$.
A shop buys a toy for $\$12$ and sells it for $\$27$. Find the profit in dollars.
$27 - 12$.
For that toy, find the percentage profit (number only).
$\tfrac{15}{12} \times 100$.
A height grows from $160$ cm to $168$ cm. Percentage increase? (number only)
$\tfrac{8}{160} \times 100$.
Percentage profit is calculated using:
Always the original (cost) amount.
New numbers every time. Keep going until you get five in a row.