Student or Learner
How much are these shoes?(pair of shoes)
How much are these sunglasses?(I'm talking about 1 kind of sunglasses)
How much are these trousers?(I'm talking about 1 kind of trousers)
1-Are these questions okay?
2-How much (is-are) the book and the pen?
2. 'How much is the book and the pen?' (if you are considering them together as a single purchase).
'How much is the book?' [wait for answer] '...and the pen?' (if you want separate prices).
'How much are the pen and the book together?'