9s, 3s+6s, -1s+10s any works
Y = kx
8 = -32k
k = -8/32 = -1/4
y = -1/4 (64)
y = -16
By proportionality, for any number

, if T is multiplied by

then the same goes for M.
a) M has been multiplied by

hence


b) T has been divided by

hence

We would multiply $30 by 5% to first find 5%
5% = 0.05
$30 x 0.05 = $1.50
Now we add that to 30
$30 + $1.50 = $31.50
Your answer is $31.50