Excellent Yachting will pay  $519,799.59.
The calculation of the present value of a lump sum for each cashflow considering the 14.5% discount rate would be as follow:
PV=nominal value/(1+i)n
rate: 0.145
Year I, Â 218,000/(1+0.145)1 = PV
       = 190,393.0131
Year II,  224,000/(1+0.145)² = PV
      = 170,858.6793
Year III,  238,000/(1+0.145)³ = PV
      = 158,547.9011
By adding each PV value together, we will get 190,393.0131+170,858.6793+158,547.9011 = $519,799.59
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