Dermatology meaning
The branch of medicine dealing with the skin, nails, hair, and their diseases. Dermatologists diagnose and treat conditions such as acne, eczema, psoriasis, skin infections, and skin cancer. They also provide cosmetic procedures like laser treatments and skin rejuvenation.
Dermatology meaning: Explanation, Formulae and Practice
These topics connect maths with money decisions. Always identify cost price, selling price, principal, rate and time before using a formula.
Practical Formulae
- Profit = selling price - cost price.
- Loss = cost price - selling price.
- Profit percentage = (profit / cost price) x 100.
- Simple interest = (principal x rate x time) / 100.
- Amount = principal + interest.
Solved Example
Question: An item is bought for Rs. 500 and sold for Rs. 575. Find the profit percentage.
Working: Profit = 575 - 500 = 75. Profit percentage = (75 / 500) x 100.
Result: Profit percentage = 15%.
Unanswered Practice Questions
Try these yourself before checking notes or calculators.
- Find the loss percentage when CP is Rs. 800 and SP is Rs. 720.
- Find simple interest on Rs. 5,000 at 8% per year for 2 years.
- A shopkeeper marks an item at Rs. 1,200 and gives 10% discount. Find the selling price.
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