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After 5 hours: \( 200 \times (0.9)^5 \)
Calculate: \( 0.9^5 = 0.59049 \)
\( 200 \times 0.59049 = 118.098 \) mg/L
Rounded to 118.10 mg/L.
#### 118.10
A digital clock displays time in HH:MM format. At what time will the clock show "11:54" exactly 276 hours later?
hours รท 24 = 11.5 days = 11 days and 12 hours.
Add 11 days (no conflict, clock repeats every 12 hours) and 12 hours to 11:54:
11:54 + 12 hours = 23:54 (11:54 PM)
Now add 6 more hours: 23:54 + 6 hours = 05:54 (5:54 AM, 12th day)