Cost is expressed by the formula tb^4. If b is doubled, the new cost W is what percent of the original cost?  Pick.
A) W=200
B) W=600
C) W=800
D) W=1600
E) W=50
Original Cost W, C1=t1*b1^4   New Cost C2=t2*b2^4....only b is doubled so t2=t1 and b2=2b1   C2=t2*(2b1) ^4   =16(t1*b1^4)   =16C1   16 times C1=&gt;1600% of C1   Ans W=1600=1600
<result>D</result>
Cost is expressed by the formula tb^4. If b is doubled, the new cost W is what percent of the original cost?