maths

1.$200÷(1-60%)
=$500

2.$1000÷(1+25%)
=$800

3a.$15╳(1+20%)
=$18

3b.25-18
_____╳100%
25
=28%

1.200÷/60%=300
The cost of the software is $300
2.1000÷(1+25%)=1000÷125%=800
The cost of this set of dolls is $800
3a.15x(1+20%)=18
The cost of each story book for the retailer is $18
3b.18÷25x100%=72%
The profit percent for the retailer is 72%.

1.
A computer software is sold at $200 with a loss of 60%.Find the cost of the software.
Cost:
= $200 x (1 - 60%)
= $200 x 40%
= $80

2.
A set of dolls is sold at $1000 with a profit of 25%.Find the cost of this set of dolls.
Cost:
= $1000 x (1 + 25%)
= $1000 x 125%
= $1250


3.
A publisher sells story books which cost $15 each to a retailer with 20% profit than sells the books at $25 each.

a.Find the cost of each story book for the retailer.
Cost:
= $15 x (1 + 20%)
= $15 x 120%
= $18

b.
Find the profit percent for the retailer.
Percentage profit:
= [(25 - 18) / 18] x 100%
= 38.9%(Correct to 3 sig fig)

1.A computer software is sold at $200 with a loss of 60%.Find the cost of the software.
Cost
= $200/(1-60%)
= $200/0.4
= $500

2.A set of dolls is sold at $1000 with a profit of 25%.Find the cost of this set of dolls.
Cost
= $1000/(1+25%)
= $1000/1.25
= $800

3.A publisher sells story books which cost $15 each to a retailer with 20% profit than sells the books at $25 each.
a.Find the cost of each story book for the retailer.
Cost
= $15x(1+20%)
= $15x1.2
= $18

b.Find the profit percent for the retailer.
Profit percent
= ($25-$18)/$18 x 100%
= 7/18x100%
= 38.89%

1. 200(1+60%)
=200*1.6
=320(元)
2.1000(1-25%)
=750(元)
3. '''''''不懂... sorry..

1.let $x be the cost of the software.
60%x=200
x=200/60%

2 let $x be the cost
x25%=1000