Sharp EL-738 Statistical Calcula- tion Formulas, Cost/Sell/Margin/Markup calculations

30/360

1.Adjust D1 and D2 according to the fol- lowing rules:

(1)If D2 and D1 are both the last day of February, change D2 to 30.

(2)If D1 is the last day of February, change D1 to 30.

(3)If D2 is 31 and D1 is 30 or 31, change D2 to 30.

(4)If D1 is 31, change D1 to 30.

2.Calculate using the following formula:

DAYS = (Y2 – Y1) ⋅ 360 + (M2 – M1) ⋅ 30 + (D2 – D1)

Actual

Percent change/Compound interest calculations

where NEW = NEW PRC(FV), OLD = OLD PRC(PV), %CH = %(I/Y), PD = PERIODS(N)

Error

%CH

NEW ⋅ OLD

Cost/Sell/Margin/Markup calculations

where MAR = MARGIN, MU = MARK UP

Breakeven calculations

75

Statistical Calcula- tion Formulas

Type	Regression formula
Linear	y = a + bx
Quadratic	y = a + bx + cx2
Exponential	y = a • ebx
Logarithmic	y = a + b • Inx
Power	y = a • xb
	1
Inverse	y = a + b
		x

x = Σnx

sx =	Σx2 – nx	2
	n – 1

σΣx2 – nx2

x = n

Σx = x1 + x2 + ··· + xn

Σx2 = x12 + x22 + ··· + xn2

Σy y = n

sy =	Σy2 – ny	2
	n – 1

σΣy2 – ny2

y =

n

Σy = y1 + y2 + ··· + yn

Σy2 = y12 + y22 + ··· + yn2

Σxy = x1y1 + x2y2 + ··· + xnyn

An error will occur in a statisti- cal calculation if:

•The absolute value of an intermediate or calculation

result is equal to or greater than 1 ⋅ 10100.

•The denominator is zero.

•An attempt is made to find the square root of a negative number.

•No solution exists for a qua- dratic regression calculation.