Step 4 is wrong. the answer is 1/8, she changed sign on 2^(-3) to 2^(3) without moving it to numerator
The Jasmine result is the good one because 1 mégas meter=1 000 000
You need to start calculating from the innermost bracket and if there are no signs to do any operation then you need to multiply
Each container is 50 pounds, forget about the second sentence it's just there to confuse you. One ton is 2,000 pounds, half of that is 1,000 lbs. 1,000 divided by 20 is 50. 50 pounds each.