Question

if 11,000 is 85% of what was in my bank account, how much did I originally have?

Answer 1

You can set it up like a proportion:

$\frac{11000}{0.85} \frac{x}{1.00}$

Cross multiply: 
11000*1 = 11000
11000/0.85 = 12,941.18

You had roughly $12,941.18 in your bank account.