By 1999, after the clean water act had been passed in 1970, the percentage of u. s. surface waters safe for fishing and swimming had increased from 36 percent to

Almost 30 years after the clean water act was passed in the US, the percentage of surface water considered safe for fishing and swimming had increased from 36% to 60% which is almost twice the original value. Certain programs and policies were implemented as part of the act.

The answer options is d

You would do 1500/4 and the answer is 375