Here are stock prices and dividends for four companies (Plague and Dengue DO NOT pay dividends). Construct a price index and an equally weighted returns index; set the initial index level to 100.

Date	CoronaCo	CC-Div	EbolaEnterprises	EE-Div	Plague Ltd	Dengue Inc
2019/1/1	$64.47		$ 26.92	$0.10	$ 57.99	$ 11.40
2019/2/1	$59.96	$0.35	$ 22.54		$ 54.81	$ 6.92
2019/3/1	$68.89		$ 26.36		$ 41.00	$ 8.01
2019/4/1	$64.51		$ 23.16	$0.10	$ 66.24	$ 7.82
2019/5/1	$62.29	$0.35	$ 20.74		$ 65.27	$ 13.53
2019/6/1	$54.48		$ 25.92		$ 47.10	$ 16.34
2019/7/1	$69.73		$ 26.54	$0.15	$ 63.68	$ 9.87
2019/8/1	$58.39	$0.35	$ 25.77		$ 62.36	$ 20.36
2019/9/1	$67.98		$ 28.98		$ 65.17	$ 6.84
2019/10/1	$50.19		$ 22.15	$0.15	$ 63.08	$ 6.46
2019/11/1	$64.18	$0.35	$ 21.69		$ 55.84	$ 6.68
2019/12/1	$67.49		$ 30.35		$ 45.04	$ 20.35
2020/1/1	$66.47		$ 27.25	$0.15	$ 66.24	$ 10.22
2020/2/1	$69.20	$0.35	$ 29.26		$ 52.08	$ 17.77
2020/3/1	$62.59		$ 21.33		$ 42.29	$ 8.56