Answer:
$255308.94 is the amount generated after 90 days
Step-by-step explanation:
Coveered interest arbitrage
Convert dollars to pounds at spot rate
250000/1.23 =£203252.0325
Invest this amount at 1.3% (Britain rate) for 90 days
203252.0325 × 1.013 = £205894.3089
Then convert back to dollars at 90 day forward rate
205894.3089 × 1.24 = $255308.94