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In this instance the main contractor did not charge GST and the subcontractor did. The main contractor got a bit of a shock when the subbieâs invoice came with the agreed upon hourly rate but then added 10% for GST.I guess the lesson here is ânever assumeâ.n this instance the main contractor did not charge GST and the subcontractor did. The main contractor got a bit of a shock when the subbieâs invoice came with the agreed upon hourly rate but then added 10% for GST.
Where st is the t-period spot rate and. ft-1,t is the forward rate applicable for the period (t-1,t) To solve for YTM we are solving for the interest rate (r) in the bond valuation formula: Where CPt is the coupon payment at time t and MV is the maturity value at time n (i.e. at maturity).