Solution: ∫ 10÷6 = 5/3 (yuan) ……………………………………………………………………………………………………………………………………….

8÷4=2 (yuan)

It is cheaper to rent a big boat than a small one. Try to rent a big boat. There can be no vacancies.

50=42+8

=6×7+4×2

∴ Hired seven big boats and two small boats.

10× 7+8× 2 = 86 (yuan)