Assume an economy does not trade with the outside world. In a given fiscal year, household spent 80% of their disposable income on consumption in addition to 600 consumption expenditure which is independent of income. Total government expenditure of 900 was supposed to be financed from a proportion tax levy of 40% on national income and a lump sum tax of 450. Total private investment spending is 700. Given that aggregate output is equal to aggregate spending. Determine the value of the multiplier.