Maths Homework Help

I'm sure there's an easier way to work it out, but this is what I thought of first. For the first year the 12,000 decreases by 3% so you'd want to take away 3% of 12,000. You'd should have learnt in class that a decrease in 3% is the same as multiplying by 0.97 (if 1 represents 100%, then 0.97 represents 100%-3%) Repeat with your new figure for year 2.
Then for the last 3 years, you'll want to calculate 7% of your new total and add it on. This is the same as multiplying by 1.07 each time.

Hope this helps!

Thank you so much! I was struggling with how to work it out because I think I was supposed to put it to the power of something by 1.07 and 1.03 or something like that, but I'll try this method now! Much appreciated!

EDIT: THANK YOU SO MUCH! IT WORKED!!!

Glad it worked! You're almost there with your thinking about powers too - to do this quicker than working each year out separately, you could also do
12000 x 0.97² x 1.07³