中三數學一條 [5分]

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B = A * (1+ 0.05) ... ... ( i ) ll( 5%= 0.05)

C = B * (1 + 0.2 ) ... ... ( i i ) ll( 20% = 0.2)

Put ( i ) into ( i i ),
we have

C = A * (1+ 0.05) * (1 + 0.2 )
= A * (1.05 )( 1.2 )
= A * (1.26 )
= A * (1 + 26% )

Therefore, C is 26% higer than A .

*Hope it helps~

B = A * 1.05

C = B * 1.2

C = A * 1.05 * 1.2

C = A * 1.26

C比A高26%

0.05乘0.2乘100%

=10%

b=a*1.05
c=b*1.2
所以 c=a*1.05*1.2=a*1.26
即係C比A高26%

Let height of A is X
height of B = 1.05X
height of C = 1.2 (1.05X) = 1.26 X

Height of C : Height of A = 1.26X : X
C is taller than A of 26%