Carl puts 1.10 in his penny bank every day in the month of july(31 days) his total savings was $55 at the end of june. what is the best estimate for carl savings at the end of july

It should be 89.1 but I am not completely sure

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.