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Secondary 1 | Maths
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Cheryl
Cheryl

Secondary 1 chevron_right Maths chevron_right Singapore

I need help for question 16 thanks

Date Posted: 1 month ago
Views: 18
snell
Snell
1 month ago
(i)
T = cd + 0.01ef

(ii)
e = (-145c)/(4-c)
=> 150 = (-145c)/(4-c)
=> 600-150c = -145c
=> c = 120

d = (f+5)/50
=> 3 = (f+5)/50
=> f = 145

T = 120x3 + 0.01x150x145
= $577.50
Cheryl
Cheryl
1 month ago
Thank u

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Teo Zhi Xiong
Teo Zhi Xiong's answer
3 answers (Tutor Details)
1st
It’s a straight forward substitution question, except that f is actually in cents so it may trick some students. It explains for the expression having /100.
Cheryl
Cheryl
1 month ago
Thank u
Teo Zhi Xiong
Teo Zhi Xiong
1 month ago
Is it correct?
Cheryl
Cheryl
1 month ago
Ya