Since he only makes commission on sales over $1000, he makes commission on $1500 (we find this by doing 2500-1000.) His commission is 15%, so find 15% of $1500: So we know how makes $225 in commission.
Now we need to add this to his fixed pay to get his total pay: So his total pay is $525, which is answer 'a'
Hope I helped, and let me know if you have any questions :)
8.12×10^5 ... i got this by taking the first number 8 and then counting the places behind the 8 which would be 5 so than you move the decimal place by 5 so you get 8.12 then you show theirs 5 places behind the 8 by adding the 10^5 so youbget 8.12×10^5