If the stock increases by 12% each year, then we'll have to multiply it by 5 to find out the increase in five years.
So,
12 x 5 = 60
Now we know that there will be an increase of 60% after 5 years. Now we will turn the percent into a decimal and multiply it by the amount of sheep (450)
So,
60/100 = 0.6
0.6 x 450 = 270
Since there is a 60% INCREASE we will add 270 to 450.
So,
450 + 270 = 720
Therefore, Langa will have 720 sheep after five years.