i think its f it just seems to be the most reasonable awnser a and i dont know this stuff :P
Step-by-step explanation:
Answer:
40.5
Step-by-step explanation:
This answer makes sense because we know that 50% of 90 is 45.
Since 45% of 90 is 40.5, we can self-check our answer.
Hope I helped!
~PumpkinSpice1♥