not getting the right proportion

I got this answer wrong. I thought it was 55% but it seems the answer is different. Please can you have a look at this and tell me where have I gone wrong and it should be. Thanks in advance.

Q) Approximately what proportion of the total number of seats in all Buses and Trains are empty?

EDITED - I FORGOT TO INCLUDE MULTPLY CHOICES

A) 45% B) 50% C) 55% D) 60% E) 65%

*Assume For Buses*
Average No of Vehicles per Day (000's) = 112
Average Distance Travelled by one Vehicle per Day (km) = 57
Average No of Seats = 55
Average Occupancy (%) = 57

*Assume For Trains*
Average No of Vehicles per Day (000's) = 89
Average Distance Travelled by one Vehicle per Day (km) = 108
Average No of Seats = 430
Average Occupancy (%) = 44


The steps I took are the following...

 Step 1- Find total seats for Buses and Trains == 55 + 430 = 485
Step 2 - Find number of empty seats for Buses == 100 - 57 = 43.
55 * 0.43 = 23.65
Step 3 - Find number of empty seats for Trains == 100 - 44 = 56.
430 * 0.56 = 240.8
Step 4 - 23.65 + 240.8 = 264.45.
Step 5 - 264.45 / 485 = 0.5452 * 100 = **55%**


EDITED STILL NOT GETTING THIS RIGHT

2nd attempt

for buses
112000 * 55 / 112000 * 43 = 616000 / 48160000 = 0.127906976
for trains
89000 * 430 / 89000 * 56 = 38270000 / 4984000 = 0.76785714

0.127906976 + 0.76785714 / 485  = 7.806478405/ 485 = 0.016095831  < this is wrong


3rd attempt

for buses
112000 * 55 / 112000 * 0.43 = 616000 / 48160 = 12.79069767
for trains
89000 * 430 / 89000 * 0.56 = 38270000 / 49840 = 76.78571429

12.79069767 + 76.78571429 = 89.57641196 / 485 = 0.184693632  < this is wrong

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You lost a zero in the numerator for buses, it should be 6160000. You should not divide by the 112000 then, and the 0.43 goes in the numerator, not the denominator. Generally when you use a slash for division, it is important to parenthesize afterward to avoid confusion. –  Ross Millikan Nov 21 '11 at 14:45