func (P *Portfolio) Invest(inv Investment) {
	inv.CalculateReturnAfterTax()
	P.Investments = append(P.Investments, inv)
	P.NetWorth += inv.ReturnAfterTax
}
// Invest invest new investment in portfolio,
// sums to NetWorth
Invest invest new investment in portfolio,
sums to NetWorth
// Invest invest new investment in portfolio // sums to NetWorth
func (P *Portfolio) Invest(inv Investment) {
	inv.CalculateReturnAfterTax()
	P.Investments = append(P.Investments, inv)
	P.NetWorth += inv.ReturnAfterTax
}
func ( P * Portfolio ) Invest ( inv Investment ) { inv . CalculateReturnAfterTax ( ) P . Investments = append ( P . Investments , inv ) P . NetWorth += inv . ReturnAfterTax }
Invest invest new investment in portfolio,
sums to NetWorth
Invest invest new investment in portfolio sums to NetWorth