根据表格回答问题。
Big Sale!
This Week Only!

	Were	This week	Will be
pencils	10 cents	5 cents	15 cents
pens	120 cents	60 cents	79 cents
exercise books	89 cents	60 cents	85 cents
letter paper (100 pieces)	2.59 dollars	2.00 dollars	2.99 dollars
All story-books		30% off
T-shirts	4.98 dollars	3.50 dollars	6.00 dollars
jackets	22.5 dollars	18.oo dollars	25.99 dollars

1. How much did two hundred pieces of letter paper cost last week?
                                                                                                                          
2. How much will you pay for three exercise books next week?
                                                                                                                          
3. If a story-book costs 15.00 dollars. How much does it cost today?
                                                                                                                          
4. If you buy a T-shirt this week, how much more money can you save than last week?
                                                                                                                          
5. How much were two jackets last Monday?
                                                                                                                          

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