The formula for calculating the CPI is

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Part $1$

A$.$

$($Expenditures in the base year

times$$

$100)/($Expenditures in the current$$ year$).$

B$.$

$($Expenditures in the base$$ year$/$Expenditures in the current$$ year$).$

C$.$

$($Expenditures in the current$$ year$/$Expenditures in the base$$ year$)$

times$$

$100.$

D$.$

$($Expenditures in the current year

times$$

Expenditures in the base$$ year$)/100.$