## Wednesday, October 21, 2015

### Ratio and Proportions

Ratio: It means comparison of two quantities by division [or] It means what part one quantity is of another quantity.
Points to Remember:
• When comparing two quantities they must be expressed in same units
• Ratio doesn't change if both the terms are multiplied or divided by same number

## Tuesday, September 30, 2014

### Arithmetic Compound Interest

Compound Interest (C.I): Compound interest is interest added to the principal so that the added interest also earns interest from then on. This addition of interest to the principal is called compounding.

## Monday, September 29, 2014

### Simple Interest Basic Formulae:

Interest: Interest is some extra money added to the principal money. i.e. Extra money paid for using other's money is called Interest.

There are two types of Interests. One is Simple Interest and another is Compound Interest.

Simple Interest (S.I): If the interest on a sum or money borrowed for a certain period is reckoned uniformly, then it is called Simple Interest.

### Basic Points to Remember:

• Cost Price: The price, at which an item is purchased, is called it's Cost Price and is denoted by C.P.
• Selling Price: The price, at which an item is sold, is called it's Selling Price and is denoted by S.P.
• Profit [or] Gain: If S.P is greater than C.P, then it is called as Profit.
• Loss: If C.P is greater than S.P, then it is called as Loss.

## Sunday, September 28, 2014

### Arithmetic Average Formulas:

• An average or an arithmetic or mean of a no. of quantities of the same type is equal to their sum divided by the no. of those quantities.
Average = (Sum of Observations)/(No. of Observations)

### Percentage Basic Concepts:

• Percentage means per 100 or for every 100. i.e. X % of Y = (X/Y)*100
Ex:  1. 20% = 20/100 = 1/5

## Saturday, September 27, 2014

### Aptitude Number Systems

Number Systems topic in Quantitative Aptitude plays an important role. In any placement exam and competitive exams like SSC, RRB, Bank Jobs, Govt. Jobs, Entrance Exams etc. minimum 3 marks from Number Systems only. In this article, we covered following topics.