To increase an amount by 30% what single multiplier would you use

The answer to this question would be 130% or 1.3

To increase by 30%, that means you need to multiply it with the initial number (100%) and the value that need to be increased (30%). The multiplier can be found by this equation

multiplier = 100% + value increase

multiplier = 100% + 30% = 130% = 1.3