Question

A manager questioned 100 employees selected as from a workforce of 7000 concerning the opinions of a proposed change in the company medical insurance plan.the medical insurance sales person claimed at least 80% of your workforce will favor this change.However,the manager's sample of 100 showed that only 70 employees in the sample favored the change.is the salespersons claim true? If not,what proportion of the total workforce favors the change?