Calculate the final concentration of salicylic acid when mixing Whitfield's Ointment (contains 3% salicylic acid), 30g, with Lassar's Paste (contains 2% salicylic acid), 60g, and White soft paraffin to a total of 200g.
A) 1.5%
B) 2%
C) 2.5%
D) 3%
E) 3.5%