a research and development laboratory researcher for a paint company is measuring the level of a certain chemical contained in...

a research and development laboratory researcher for a paint company is measuring the level of a certain chemical contained in a certain type of paint. If the paint contains too much of this chemical, the quality of the paint will be compromised. On the average, each can of paint contains 10% of the chemical. How many cans of paint should the sample contain if the researcher wants to be 98% certain of being within 1% of the true proportion of this chemical? The answer is 4887, but i can't figure out the steps and work to get there