For simple interest, we have this interest equation I = Prt (I is the interest, P is the loan amount, r is the annual rate as a decimal and t is the time in years). In our case this equation takes the form 90 = 3000*0.15*d, which implies d == = of an year = 365/5 days = 73 days. 73 days after June, 9 is August, 21. // ( I used online date calculator https://www.timeanddate.com/date/dateadded.html?d1=9&m1=6&y1=2000& ) ANSWER. The maturity day is August, 21. ANSWER