0 l3. A biologist is developing two new strains of bacteria. Each sample of Type I produces four new viable bacteria, and each sample of Type II produces three new viable bacteria. Altogether, at least 240 new viable bacteria must be produced. At least 30, but no more than 60, of the original samples must be Type I. Not more than 70 of the samples can be Type II. A sample of Type | costs $5 and a sample of Type II costs $7. How many samples of Type II bacteria should be used to minimize cost? a. 0 b. 30 c. 60 d. 70