Answer:
The final number is 78.75
Step-by-step explanation:
we know that
1) The number 450 is increased by 75%
The number 450 represent 100%
Remember that
[tex]100\%+75\%=175\%=175/100=1.75[/tex]
so
The increased number is
[tex]450(1.75)=787.5[/tex]
2) The result is then decreased by 90%
In this moment
787.5 represent the 100%
Remember that
[tex]100\%-90\%=10\%=10/100=0.10[/tex]
The decreased number is
[tex]787.5(0.10)= 78.75[/tex]
therefore
The final number is 78.75
