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Filename: controllers/calculator.php

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Percent change calculator is used to determine the percent increase and percent decrease of an article over a period of time. Percent change mainly focus on two types that is percent increase and percent decrease. Sale price of an article is increased form specified rate it is called as percent increase. Sale price of an article declined from its existing value is called as percent decrease

**Example 1: A mobile phone price is $200 in last year. This year mobile price is reduced to $180.Calculate the percent change.**

Solution: We can observe that value of the mobile phone is depreciated (means decreases)

To calculate the percent change by using this formula.

Percent decrease = (Older value – Newer value) ÷ Older value.

Solution: We can observe that value of the mobile phone is depreciated (means decreases)

To calculate the percent change by using this formula.

Percent decrease = (Older value – Newer value) ÷ Older value.

= ($200 - $180) ÷ $200

= ($20) ÷ $200

= $0.1

= ($20) ÷ $200

= $0.1

Multiply with 100, we will get the value in percent.

= 0.1 *100

=10 %

So, Mobile phone price is 10% decreased when compared to last year.

**Example 2: The staff in a company is increased from 20 to 32.calculate the percent change.**

Solution: We can observe that staff in a company is increased.

To calculate the percent change by using this formula.

Percent increase = (Newer value – Older value) ÷ Older value.

= (32 – 20) ÷ 20

=12÷20

= 0.6

Multiply with 100, we will get the value in percent.

= 0.6 *100

= 60 %

So the staff in a company is increased by 60%

= 0.1 *100

=10 %

So, Mobile phone price is 10% decreased when compared to last year.

Solution: We can observe that staff in a company is increased.

To calculate the percent change by using this formula.

Percent increase = (Newer value – Older value) ÷ Older value.

= (32 – 20) ÷ 20

=12÷20

= 0.6

Multiply with 100, we will get the value in percent.

= 0.6 *100

= 60 %

So the staff in a company is increased by 60%