Answer:
Total increase in deposit  = $54,200,000 
Explanation:
given data
deposits = $20 million dollars
bank reserve = 10%
solution
we know that Deposit in bank A  is = $20,000,000
and  Reserve @ 10%   = $2,000,000
so 
Bank A loans or bank B deposit  will be = $20,000,000  - $2,000,000
Bank A loans or bank B deposit  = $18,000,000
here  Reserve @ 10%  = $1,800,000
so 
Bank B loans or Bank C deposit  will be here = $18,000,000  - $1,800,000
Bank B loans or Bank C deposit = $16,200,000
so that 
Total increase in deposit will be = Bank A + Bank B + Bank C     ...............1
put here value we get 
Total increase in deposit  = $20,000,000 + $18,000,000 + $16,200,000
Total increase in deposit  = $54,200,000