The following table depicts how an investor averages out the unit price over a few months in 2021 by investing in a fixed, monthly amount amidst the Ringgit prices fluctuations.

Month	Investment amount	Unit price	Units acquired
January	RM400	RM0.6015	(1)
February	RM400	RM0.5944	672.95
March	RM400	RM0.5626	(2)
April	RM400	(3)	714.41
May	RM400	(4)	685.40
June	RM400	RM0.5521	724.51
July	RM400	RM0.5430	736.65
August	RM400	RM0.5379	743.63
September	RM400	RM0.5325	751.17
October	RM400	RM0.5009	(5)
November	RM400	RM0.4988	801.92
December	RM400	(6)	873.93

a) Solve (1) to (6) based on the information given.

b) Examine average cost per unit for this investment in 2021.

c) If this unit trust suddenly declared Shariah non-compliant on 1st July, propose the necessary measures with supporting evidence of calculation assuming that investor was unrealized about the ruling (NAV December 31: RM0.5000).