Cost is expressed by the formula tb^4. If b is doubled, the new cost is what percent of the original cost? Select
A) 200  B) 600  C) 800  D) 1600  E) 50
Original Cost 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 1600=1600
<result>D</result>
Cost is expressed by the formula tb^4. If b is doubled, the new cost is what percent of the original cost?