1. (+48)÷(-2)=
2. +126/-9 =
3. (+7)÷(- 7/2)÷ (-2 )÷ (+1/4) =
4. (+2)x(-10)÷(+4)x( -1/5 )
5. -(-5)÷(- 1/3)÷(+3/4 ) x (-2)
6. Mr.Lee sells 250 pieces of Item A at a profit of $5 each, and 300 pieces of Item B at profit of $12 each, but 420 pieces of Item C at a loss of $20 each . What is the overall profit or loss made by Mr.Lee?