Using R-Studio, estimate a regression equation to determine the effect of the real interest rates, the exchange rate and the GDP growth rate on the Merchandise trade (% of GDP). (All codes and regression output should be provided). NOTE: R-Studio should only be used for obtaining the regression output and the regression equation. (i) Write down the regression equation.

Year	Merchandise trade (% of GDP)	Real interest rates (%),	GDP growth (annual %)	Official exchange rate (per US$).
2000	150.28	10.05	-1.4	182.43
2001	149.12	16.63	2.3	187.32
2002	144.60	13.36	1.1	190.67
2003	146.56	9.81	-0.6	193.88
2004	157.91	7.27	1.6	198.31
2005	162.57	6.42	-2	199.88
2006	62.06	-58.33	5.1	200.19
2007	63.64	5.91	7.2	202.35
2008	69.65	4.44	1.6	203.63
2009	60.78	13.56	3.9	203.95
2010	66.33	9.79	3.8	203.64
2011	78.56	11.91	5.3	204.02
2012	84	8.83	5.4	204.36
2013	77.98	14.11	3.7	205.39
2014	71.66	15.26	1.7	206.45
2015	61.76	9.54	0.7	206.45
2016	64.45	11.99	3.8	206.50
2017	64.89	10.67	3.7	206.50
2018	79.10	16.36	4.4	207.72
2019	108.37	7.30	5.4	208.50