Could you tell me which of the following sentences is correct?
1. The pink dress is 100 dollars cheaper than the red one.
2. The pink dress is cheaper than the red one by 100 dollars.
3. The pink dress costs 100 dollars less than the red one.
Thanks a lot.
I've run short of money, and payday isn't till next week. I think I'll buy the pink dress - it's $100 cheaper than the red one.
But I'm shopping with a friend. We've seen a pink dress we quite like. Your friend says 'How about this - I prefer the colour'. And you say 'But that red dress is $100 more expensive than the pink one.'
You choose the comparative adjective that suits the context - of cheapness or expensiveness.