Question

la)
If 80 is increased to 90, find the
percentage increase
(b)find the value when 120 is
decreased by 15%​

Answer 1

Answer:

A. 112.5% B. 102

Step-by-step explanation:

X*80/100= 90

90*100/80=X

85/100 * 120 =102

Answer 2

Answer:

a) 12.5%

b)102

Step-by-step explanation:

(I)

net increase=90-80=10

so %increase =

$\frac{10}{80} \times 100 = \frac{100}{8} = \frac{25}{2} = 12.5\%$

(II)as decrease is 15%, left part = (100-15)%=85%

so 85%of 120 is

$120 \times \frac{85 }{100} = 6 \times \frac{85}{5} = 6 \times 17 = 102$