30gm of 1% hydrocortisone mixed with 40 gm 2.5% hydrocortisonen what is the concentration of the resulting solution

30gm of 1% hydrocortisone mixed with 40 gm 2.5% hydrocortisonen what is the concentration of the resulting solution:
a) 3%
b) 1.85%
c)10%
d) none of the above
30gm--------------1% ------------=0.3gm 40gm--------------2.5% --------------=1gm So, 70gm-------------X%--------------=1.3 So, the con. Result =1.3/70=1.857%.