A can do 10% work in 1.8 days. B takes 6 more days than A. Efficiency of C is 20% more than A. A starts a work and on every second and third day B and C join him respectively, then in how many days will 80% of the work be completed?
1
\(7\frac{9}{{10}}\) days
2
6.5 days
3
\(8\frac{35}{{44}}\) days
4
7 days
5
None of these