Answer:
Ok so 100% - 40% = 3/5 but if you do it in a decimal its 0.6 but if you subtrack 15 - 40% it kinda a impossible problem so lets try 40% - 15 = 73/5 and as a decimal 14.6...Uhm thats really all I can give you for your problem.
Explanation:
Hope this helps! Have a good day!:) and happy St. Patrick's day lol