造纸厂去年计划造纸1600吨，实际造纸1800吨，实际超产百分之几？
解：（1800﹣1600）÷1600
=200÷1600，
=12.5%．
答：实际超产12.5%
有一种物质俗称铁红，常用作红色油漆和涂料，它的化学式为( )
–Which hair band do you like best, madam?–I can't decide now. I really don't know _________.
