In the percent increase or decrease problems, the portion is

Amount of increase or decrease

Explanation:

The percentage increase and reduction are applied to the sale price of a commodity. Before changing the value of a product, variables such as inflation, supply and demand, are taken into account in relation to installments. In percentage increase or decrease, the portion refers to the amount of increase or decrease. This amount is observed through the calculations:

x + p%. x = x + p/100. x

x = It is the value of the merchandise or product in dolars ($);

p = is the percentage of increase that affects the product, which, in this case, is x;

+ = The plus sign (+) represents the increase.

% = this symbol (%) can be represented as a fraction: 1/100.

x - p%. x = x - p/100. x

x = It is the value of the merchandise or product in dolars ($);

p = is the percentage of increase that affects the product, which, in this case, is x;

- = the minus sign (-) is the discount;

% = this symbol (%) can be represented as fraction 1/100.