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1 ) The figure shows a bottle of ' lucky stars ' . If 50 lucky stars weigh about 42g , estimate the weight of each lucky star .

2 ) Jacky is studying abroad and his school fee each year is $80 860 . It is known that his monthly expenses not including school fee are $9 800 . Round up the figures to check whether $ 220 000 is enoug for Jacky to use in a year .

3 ) Product A B C D E
Price $6.9 $4.2 $15.8 $5.7 $4.8

The table above shows thr prices of some products sold in a supermarket . Round off the prices to the nearest dollar and estimate the total amount that Sally has to pay if she buys one piece of each product above .