Given formula : , where P is initial amount inveted , r is rate of interest ( in decimal) and A is the compound amount at the end of t years.
If Mario puts $1000 in a savings account earning 4%(4% = 0.04 in decimal ) annually after 10 years, then substitute P=1000 ; r= 0.04 and t=10 in the given formula , we get
Hence, the amount he will get after 10 years = $1428.24
Well since there are eight sections of 1-8 that meanst there are 8 different number 5s, and since there are eight sections of 8 it becomes 64, so if my math is correct 8/64ths of the time or 1/8. It might be wrong but I tried.