4.1	199855
4.2	216784
4.3	25931  for i = 10%
4.4	4326, 64360
4.6	15183
4.11	A: -57954
	B: -53176
4.13	Concrete: -643294
	Galvaniz: -731082
4.14	I : -20804
	II: -19935
4.29	280993
4.31	668207
4.32	-2000 for both