Question

"Arjun" can complete a task on his own in 20 days. "Bhuvan" requires 5 days more than "Chirag" to finish the same task, where "Chirag" is 20% less efficient than "Arjun." On the first day, "Arjun" began the work alone. On the second day, "Bhuvan" joined him, and on the third day, "Chirag" also joined, with all three continuing together for 12 days. Afterward, all three left the task, and the remaining work was finished by "Dinesh," who has an efficiency of 'd' units/day, in 8 days. The total work amounts to 300 units. Which of the following statements is/are true according to the information given above?
I. 7.5d + 120 = 150
II. ‘Amit’ is 275% more efficient than ‘Dinesh’
III. ‘Bhuvan’ takes (3d + 28) days to complete the work alone.

A Only II
B Only III
C Only I and II
D only I
E Only I and Ill
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