Question 1080997
15 coins total.

{{{ E = (3/15)*0.05 + (7/15)*0.10 + (5/15)*0.25 = (1/15)(3(0.05) + 7(0.10) + 5(0.25)) = (1/15)(0.15+0.70+1.25) = 0.14 }}}   or   14 cents.