Answer:
1.it was a 25 percent decrease
2.it was a 28 percent decrease
3.it was a 26 percent increase
4. it was a 37 percent decrease
Step-by-step explanation:
1. if it increased by 25 percent
t + .25t = 1.25 t
then decreased by 40 percent {use 1.25t}
1.25t - .4(1.25t)
1.25t - .5t
.75t
the difference from t to .75 t is (t-.75 t) is .25 t or 25 percent
it was a 25 percent decrease
2. t decreased by 60
t - .6 t = .4 t
then increased by 80 {use .4t}
.4t + .8 (.4t)
.4t+.32t =.72t
the difference from t to .72 t is (t-.72 t) is .28 t or 28 percent
it was a 28 percent decrease
3. t increased by 5 percent
t + .05 t = 1.05 t
then increased by 20 {use 1.05t}
1.05t + .2 (1.05t)
1.05t+.21t =1.26t
the difference from t to .72 t is (1.26 t-t) is .26 t or 26 percent increase
it was a 26 percent increase
4. t decrease by 10 percent
t - .1 t = .9 t
then decreased by .3 {use .9t}
.9t - .3 (.9t)
.9t-.27t =.63t
the difference from t to .72 t is ( t-.63t) is .37 t or 37 percent decrease
it was a 37 percent decrease
