We need to use the next simple interest formula:

Where 
P= Present value
r= annual interest rate in decimal form
T=time in years
A=amount after time 
Hence, we have that 
A= S1,737
r=2.802%/100=0.02802 
t=50/360
P=?
Replacing on the given formula:

Hence, the purchase price is $1730.27