Please help me to solve this question and show the all calculations with proper formula ...............to find the correct answer. THanks in advance

Door2DoorCo are a large courier company who have just received a shipment of X new vans. They wish to lock in a tyre supply contract to keep these vans well shod over the Y months that they intend to keep the vans. The vans come with low quality tyres that will need to be replaced in 2 months. Two suppliers, ThriftyTread and WiserWheels have expressed interest at supplying tyres at a fixed price for the duration. The offers are summarised below: Assignment Allocation Number of Vans, X Alpha or Beta 120 J12.68 % p.a. Corporate Discount Rate Initial Tyre Life 2 months. Keep vans for (Y) 50 months ThriftyTread Tyre price Tyre life Tyres replaced at $100.00 . Four months 2, 6, 10, 46, 50 months WiserWheels Tyre price Tyre life $148.00 Six months 2, 8, 14,44, 50 months Tyres replaced at For each of the two potential suppliers, illustrate Door2Doorco's tyre expenditure for the new vans as a fuly labelled timeline diagram. (Remember that there are X new vans, and assume each van has 4 tyres.) a) Determine the value in period 2 dollars of the expenditure stream if Door2 DoorCo decide to go with ThriftyTreads. [Hint, you will firstly need to find the ja rate equivalent to the corporate discount rate, you will then need to find the PV of the expenditure stream in period 2 dollars] b) c) Thus determine the present value of the expenditure stream if Door2DoorCo decide to go with ThriftyTreads. [NB this is a bit tricky and is aimed at stronger students] d) Determine the value in period 2 dollars of the expenditure stream if Door2 DoorCo decide to go with WiserWheels. e) Thus determine the present value of the expenditure stream if Door2DoorCo decide to go with WiserWheels [NB this is a bit tricky and is aimed at stronger students] f Comparing your answers for part (b) with part (d), OR part (c) with part (e), explain which tyre supplier Door2DoorCo should choose. Door2DoorCo are a large courier company who have just received a shipment of X new vans. They wish to lock in a tyre supply contract to keep these vans well shod over the Y months that they intend to keep the vans. The vans come with low quality tyres that will need to be replaced in 2 months. Two suppliers, ThriftyTread and WiserWheels have expressed interest at supplying tyres at a fixed price for the duration. The offers are summarised below: Assignment Allocation Number of Vans, X Alpha or Beta 120 J12.68 % p.a. Corporate Discount Rate Initial Tyre Life 2 months. Keep vans for (Y) 50 months ThriftyTread Tyre price Tyre life Tyres replaced at $100.00 . Four months 2, 6, 10, 46, 50 months WiserWheels Tyre price Tyre life $148.00 Six months 2, 8, 14,44, 50 months Tyres replaced at For each of the two potential suppliers, illustrate Door2Doorco's tyre expenditure for the new vans as a fuly labelled timeline diagram. (Remember that there are X new vans, and assume each van has 4 tyres.) a) Determine the value in period 2 dollars of the expenditure stream if Door2 DoorCo decide to go with ThriftyTreads. [Hint, you will firstly need to find the ja rate equivalent to the corporate discount rate, you will then need to find the PV of the expenditure stream in period 2 dollars] b) c) Thus determine the present value of the expenditure stream if Door2DoorCo decide to go with ThriftyTreads. [NB this is a bit tricky and is aimed at stronger students] d) Determine the value in period 2 dollars of the expenditure stream if Door2 DoorCo decide to go with WiserWheels. e) Thus determine the present value of the expenditure stream if Door2DoorCo decide to go with WiserWheels [NB this is a bit tricky and is aimed at stronger students] f Comparing your answers for part (b) with part (d), OR part (c) with part (e), explain which tyre supplier Door2DoorCo should choose