Answer:
4 lessons
Step-by-step explanation:
add 125 to 50 which gives you $175
the do 700÷175 which gives you 4
3 bulbs should be flawed
2+ 18 = 20
20 bulbs were examined
2/20 = 1/10 were flawed
looking at the next 30 bulbs
30 * 1/10 = 3
3 of the next 30 bulbs should be flawed
42
