The Cost of Bills Index in Mount Pleasant is 82, which is 18% lower than the national average for household bills. The average Mount Pleasant household pays $1,751 a month, or $21,013 a year for the 10 most common household bills. Mount Pleasant households spend 45% of their income on household bills. The household expenses in Mount Pleasant, on average, are 18% lower than the national average of $2,126, and 8% lower than the state average of $1,897.