Get value between 2 point based on percentage

Let’s establish some basic premise:

Vector Example

A=0%= Vector 0,0,0

B=100%=Vector 20,20,20

Input =0.8=Expected Vector 16,16,16

BInput = 20,20,200.8 = 16,16,16.


Integer Example

A=0

B=50

Input=0.675

Binput=500.675=33.75


So your formula is:
B*Input