The table below shows the total expenditure on a basket of goods and services. Use this information to calculate the index number for the cost of a basket of goods and services for Period 4. Round your answer to 1 decimal place. Total Expenditure Index Number Period 1 $3,600 92.3 Period 2 $3,820 97.9 Period 3 $3,900 100 Period 4 $4,210