Mathematical equation in vba - vba

Question

I have mathematical equation which I am performing in sheet "Accrued Expenses" on Range("E7"). The formula is intend to loop till the lastrow in column C The two key sheets are "Start page" and "Accrued Expenses" .
The problem is that I am not able to get into VBA code. It works using the Excel macro recorder, but it wont be efficient for maintenance. My equation and code below.
=('Accrued Expenses'!C7*'Start page'!$F$5)/'Start page'!$F$13*'Accrued Expenses'!D7
In Excel recorder code and with a loop:
Option Explicit
Sub Calculating_Accruedexpense()
Sheets("Accrued Expenses").Select
Dim LastRow As Long
LastRow = ActiveSheet.Range("C" & Rows.Count).End(xlUp).row
Range("E7").Select
Do Until ActiveCell.row = LastRow + 1
If IsEmpty(ActiveCell) Then
ActiveCell.FormulaR1C1 = _
"=('Accrued Expenses'!RC[-2]*'Start page'!R5C6)/'Start page'!R13C6*'Accrued Expenses'!RC[-1]"
End If
ActiveCell.Offset(1, 0).Select
Loop
End Sub
Excel Recorder line:
ActiveCell.FormulaR1C1 = _
"=('Accrued Expenses'!RC[-2]*'Start page'!R5C6)/'Start page'!R13C6*'Accrued Expenses'!RC[-1]"

Answer 1

Try this:
Sub Calculating_AccruedExpense()
Dim lastRow As Long, cl As Range
lastRow = Worksheets("Accrued Expenses").Range("C" & Rows.Count).End(xlUp).Row
For Each cl In Range("E7:E" & lastRow)
If IsEmpty(cl) Then
cl = (cl.Offset(0, -1) * Worksheets("Start page").Range("F5")) / Worksheets("Start page").Range("F13") * cl.Offset(0, -2)
End If
Next cl
End Sub