Please anyone see if I did this correct let me know the missing number for the bottom part

What is the value of this expression when b= 5 6 (2b-4)

15/16 as a decimal rounded to the nearest hundredth

Aaron invested a total of $4,100, some in an account earning 8% simple interest, and the rest in an account earning 5% simple interest. how much did he invest in each account if after one year he earned $211 in interest? select one: a. $200 at 8%, $3,900 at 5% b. $3,200 at 8%, $900 at 5% c. $900 at 8%, $3,200 at 5% d. $3,900 at 8%, $200 at 5%