Answer:

he stills need to travel 30km(20%)

Step-by-step explanation:

Method 1

We start by converting 80%  to a fraction :

80% = 4/5

Then we have

80% of 150 = 4/5 x 150 = 4/5 x 150/1 = 600/5

Notice that 150 was rewritten as the fraction 150/1, and that to multiply two fractions together, you simply multiply the numerators and denominators.

In order to find the simplest form of the fraction 600/5 we cancel out the greatest common divisor of 600 and 5, which is 5 :

600/5 = 120/1

So the final answer is

80% of 150= 120

Method 2

Alternately, we can convert 80% directly to a decimal:

80% = 0.8

Then, doing the calculation by hand or with a calculator, we find

80% of 150 = 0.8 x 150 = 120.0

So the final answer is

80% of 150=120.0