Answer: 91.8 percent
Step-by-step explanation: We know that 49 multiplied by something will equal 45. Make this an solvable equation: 49x=45. Solve for x. X=45/49, or 0.9183. Move the decimal two points to the right to get a percentage decrease of 91.8. You can check this by multiplying 49 times 91.8 to see if you get 45. Hope this helped :)