Answer:
Initial Amount at the start of the mission[tex]=\$20000[/tex]
Step-by-step explanation:
Let initial amount[tex]=x[/tex]
In Cario James withdrew [tex]\$5000[/tex].
Remaining Amount[tex]=x-5000[/tex]
In Instanbul he with drew half of the remaining amount so half of the remaining amount will be left.
[tex]\frac{1}{2}\times(x-5000)=7500\\\\x-5000=15000\\\\x=20000[/tex]