Answer: 
Step-by-step explanation:
three-fifths of a number means multiply three-fifths by a variable 
increased by 10 means addition +10
together it is 
I =Prt
I = ?
P= 900
R= 0.09
T = 1
I = 900(0.09)(1)
I = 81
Don has to pay $81 dollars SI in his loan
What? You bought a call with options, and 50 lightning??
Can u plz give me more details? i mean thats cool and all but do you need help?
The simplified answer of 6/9 is 2/3.