Let me tell you a key word in this blob. "Each" (Keep in mind I'm from the US so I'll use the dollar symbol, but just swap out the dollar symbol for yours. It'll be the same answer)
When they are talking about something coming monthly you need to look at it pretty closely to see what they are talking about.
At the end they want to know how much money we have saved. And in the blob it tells us we save 6% of the 2000 every month. To take the percent of something you need to first turn 6% into a decimal. To do so either divide 6 by 100, or move the decimal point back 2 to get:
0.06
Then multiply that by 2000.
Which equals 120 a month.
What you can also do. Is take 1% of 2000 then multiply by 6. To take 1% move the decimal over two places. (The reason why that works is because you are multiplying .01 which is the same as multiplying by: 1/100. And when you divide by 10 or 100 you just move the decimal over for every zero)
So 1% of 2000 is 20.
20 * 6 = 120
Same answer.
Now we need to know how many months it will take to get 480.
Seeing as 120 is the amount we save in ONE month we can set up an equation like this to solve:
120x = 480
Divide both sides by 120.
x = 480/120
Keep in mind when there are zeros at the END of the numbers for both of them. You can cancel them out THEN divide. It will come out to the same answer, but if you are using long division to divide it could be a bit easier.
x = 48/12
12*1 = 12
12*2 = 24
12*3 = 36
12*4 = 48
Our answer is 4 months!