Step-by-step explanation:
All u have to is subject t from that formula.
D=C( 1 + rt/100)
D/C = 1+ rt/100
D/C - 1 = rt/100
So,
When u multiply the equation by 100 and divide by r it will be as follows.
(D/C -1)100/r = t
It is the answer C.
And now to get the answer E,
we have the equation as t = (D/C-1) 100/r
First solve what inside the bracket.
D/C - 1
D/C - C/C
(D-C)/C
So when u put that to the above,
t= (D-C/C) 100/r
Now all u have to do is just multiply
t= 100(D-C) / Cr
