STD VIII – RATIO AND PROPORTION (Online)

Profit, Loss, and Discount

When we buy a thing by paying some money and sell it back, then definitely we will be in either profit or loss. This profit and loss depends on selling and cost price.

Profit and loss is very useful in our daily life. Profit and loss can be seen very useful in field of business, finance and other transactions in our day to day life. It includes what % of total profit or total loss is gained. Both profit % and loss % are calculated on behalf of cost price.

Simple Interest

If a person with a bank account, credit card or bank loan will come across aspects of simple interest and compound interest. However, many people have difficulty in distinguishing between the two types of interest and how they should be calculated. In this course you will learn why simple interest is called simple interest, how simple interest is used in daily life and how it is calculated.

Compound interest, as the name implies, is a little more complicated but this course explains the concept clearly and covers the methods used for calculating compound interest

Direct and Inverse Variations.

For direct variation, use the equation y = kx, where k is the constant of proportionality. For inverse variation, use the equation y = k/x, again, with k as the constant of proportionality.

Direct and Inverse Variation

Direct variation describes a simple relationship between two variables. We say y varies directly with x if:

y=kx

Inverse Variation

Inverse variation describes another kind of relationship. We say y varies inversely with x ,if :

xy=k