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primary 6 | Maths
| Percentage
2 Answers Below
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Date Posted: 4 years ago
Views: 307
$8+$10 then *80% that is part 1
For part b,24.80*100/80you get $31,($31-5)/2 you get second book
(a)
before discount
1st bk = $10 ; 2nd bk = $8
after discount
price of 1st bk = 0.9x10 = $9
price of 2nd bk = 0.8x8 = $6.40
Kim paid 9+6.40 = $15.40
(b)
before discount
1st bk = u + 4 ;
2nd bk = u
after discount
price of 1st bk = 0.9x(u+4)
= 0.9u + 3.6
price of 2nd bk = 0.8xu = 0.8u
Hao paid $24.80
0.9u + 3.6 + 0.8u = 24.80
u = $12.47
price of 2nd bk before discount
is $12.47.
...
before discount
1st bk = $10 ; 2nd bk = $8
after discount
price of 1st bk = 0.9x10 = $9
price of 2nd bk = 0.8x8 = $6.40
Kim paid 9+6.40 = $15.40
(b)
before discount
1st bk = u + 4 ;
2nd bk = u
after discount
price of 1st bk = 0.9x(u+4)
= 0.9u + 3.6
price of 2nd bk = 0.8xu = 0.8u
Hao paid $24.80
0.9u + 3.6 + 0.8u = 24.80
u = $12.47
price of 2nd bk before discount
is $12.47.
...
(a)
before discount
1st bk = $10 ; 2nd bk = $8
after discount
price of 1st bk = 0.9x10 = $9
price of 2nd bk = 0.8x8 = $6.40
Kim paid 9+6.40 = $15.40
(b)
after discount
price of 1st bk = u + 4
price of 2nd bk = u
Hao paid $24.80
u + u+4 = 24.80
u = $10.40
price of 2nd bk after discount
is $10.40.
price of 2nd bk before discount
is $10.40/0.8 = $13.00
...
before discount
1st bk = $10 ; 2nd bk = $8
after discount
price of 1st bk = 0.9x10 = $9
price of 2nd bk = 0.8x8 = $6.40
Kim paid 9+6.40 = $15.40
(b)
after discount
price of 1st bk = u + 4
price of 2nd bk = u
Hao paid $24.80
u + u+4 = 24.80
u = $10.40
price of 2nd bk after discount
is $10.40.
price of 2nd bk before discount
is $10.40/0.8 = $13.00
...
See 2 Answers
Ideally, Kim 1st book $10 and 2nd book = $8 in order to enjoy the discount.
1st book = 10% discount
100%= $10
10% = $1
90%=$9
2nd book = 20%
100%=$8
10%=$0.80
80%=$6.40
Kim pay $9+$6.40= $15.40
1st book = 10% discount
100%= $10
10% = $1
90%=$9
2nd book = 20%
100%=$8
10%=$0.80
80%=$6.40
Kim pay $9+$6.40= $15.40
done
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Part b). Hope this helps
Date Posted:
4 years ago
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