There are three problems to be solved: Problem #1. We are Bechtel, a private US

There are three problems to be solved:
Problem #1. We are Bechtel, a private US construction firm. We bid to develop the airport and the surrounding area for Thailand. We are not sure whether the Thai transportation authorities will grant us the business, but we hope they will. If we are awarded the contract, for which we bid $ 1 billion, we shall need to buy Thai materials and labor for 2 years. Assume that the purchases we need to make are half in one year and half the year, after the next one. The project will be completed in three years from the present. We expect the Thai bhat will revalue in the next 2 years. We have two choices. One is to hedge, paying the labor and materials in the next two years, and the other is to leave an open position.
The data we have are the following. The Spot ER, forward ER now, forward rate in one year and spot rate in one year are 24, 30, 28 and 27 bhat per $. The call and put option premia on bhat and dollars for exercise prices of 30 bhat per dollar and 25 bhat per $ are 2% and 1% of the value. The time period of the options is two years. Analyze what the best solution is. Show it 1) mathematically and 2) verbally.
Why may we perhaps not hedge?
Problem #2. We have 100 million South African rand that is payable in one year (we have to pay it to a South African company.) Assume the spot exchange rate is 10.05 rand equal one US dollar. Also, assume that the forward exchange rate is 10 rand equal one dollar. We expect the future spot rate to be 9.8 rand per $1. Furthermore, either calls or puts cost .01(1%). The exercise price of the options is 10 rand per dollar and 11 rand per dollar for both types of options.
Expound on how to hedge the aforementioned exposure. Moreover, the market expectation is that the rand will appreciate against the dollar. We want to implement transactions exposure hedging.
Ascertain that we use 1) a forward contract, or an options approach.
Problem #3. SMU Corporation has future receivables on NZ$4,000,000 in one year. It must decide whether to use options or a money market hedge to hedge this position. Determine which hedge is most appropriate and compare it to an unhedged strategy.
Spot rate of NZ$ $0.54
One-year call option Exercise price =$0.50 premium = $0.07
One-year put option Exercise price = $0.52 premium = $0.03
One-year Forward rate $0.51
US New Zealand
One-year interest rates 9% 6%