> Business Math Question?

Business Math Question?

Posted at: 2014-12-05 
Rbd = D/F * 360/t (Rbd = bank discount rate)

Where: D = dollar discount from face value, F = face value,

T = days until maturity, 360 = days in a year

118.75 / 10,000 * 360/91

= 0.01188 * 3.95604

= 0.04698, or 4.698%

yrs

On January 18, 2007, business week reported yields on treasury bills. Bruce martin purchased a 10,000 13-week treasury bill at 9,881.25.

(A)What was the amount of interest (which i know is 118.75)

(B)What was the effective rate of the interest?

Can someone tell me HOW you figure out B?