The exchange rate between non-fixed currencies continuously fluctuates. The following chart shows the exchange rate of the pound sterling to the Japanese yen over a period of six days.Day£:¥Monday1:148.176Tuesday1:144.209Wednesday1:149.890Thursday1:141.014Friday1:138.650Saturday1:143.007If Grace traded ¥34,712 for £242.73, on what day did she make her exchange?