Percents have to fit into 100.
So, 20x5= 100
19x5=95
So, your answer is: 95%
Since
simple interest = Pit
where
P=principal
i=interest rate
t=time,
we see that the equation is one of joint variation, meaning that simple interest is a direct variation with each variable, P, i or t.
Therefore if ANY one of the variables is doubled, the simple interest is also doubled.