How to calculate sensitivity analysis at a 20% variance when the NPV, IRR, MIRR, PI, Payback, Discounted Payback also sales growth rate, cost of capital, unit costs, sales price) on the estimated NPV or IRR in order to demonstrate the sensitivity of the model

YEAR	2018	2017	2016	2015
Accumulated Equity (E)	30801	35226	40082	52273
Accumulated Liabilities (D)	42561	54546	57402	64266
E+D=V	73362	89772	97484	116539
E/V*Re	0.087286714	0.081578726	0.085481185	0.093252531
D/V*Rd	0.000696181	0.000729127	0.000706602	0.000661746
WACC	8.80%	8.23%	8.62%	9.39%
Cost of Equity	20.79%
Cost of Debt	0.12%

Cost of Fixed Assets for Project (FA)	$680,000,000
Shipping & Installation fee	$25,000,000
Depreciation Basis	$705,000,000
Unit Sold in Year 1	2,560,000
Required NOWC as % of Sales	12%
Annual Growth Rate of Sales	5.5%
Unit Sales Price in Year 1	$255
Variable Costs (VC) per Unit in Year 1	$200
Annual Inflation: Growth in Sales Price	1.80%
Annual Inflation: Growth in VC per unit	1.80%
Company Tax Rate*	36.78%
WACC**	8.79%
Market Value of FA at Salvage	$16,927,329
Fixed Asset MACRS Class	10 years
Duration of the project	11 years