Add my answer to Exercise 2.40.

Included are the following 2 files:

	Exercise_2.40.scm
	Test_for_Exercise_2.40.scm

Thank you!
							Lawrence R. Amlord
							   Jun 5th, 2013
							   Xi'an, China
Add my answer to Exercise 2.41.

Included are the following 2 files:

	Exercise_2.41.scm
	Test_for_Exercise_2.41.scm

Thank you!
							Lawrence R. Amlord
							   Jun 5th, 2013
							   Xi'an, China