Answer:
The answer is the first one, the use of 1 color in a variety of tints and shades. Keep in mind that mono means 1. This will help you in the future.
Explanation:
Php 2,100.25 lunches cost in 15.5 weeks
2.Php 1,506.75 she'll earn in 21 hours
3. Php 17,061 he'll pay each month
4. 2.74 m it's still the same cause it's finding what's it's length