A retailer bought a watch for Rs 800 and fixed its price 25% above the cost price. He/she then allows 10% discount. (i) Find the marked price of the watch.
(ii) Find the discount amount.
(iii) Find the selling price of the watch.
(iv) How much should a customer pay for it with 13% VAT? ​

a. $1000

b. 100

c. 900

d. 1017

Step-by-step explanation:

a.

marked price = 800×1.25=1000

b.

discount amount

1000×0.9=900

1000-900=100

c.

1000×0.9=900

d.

900×1.13=1017

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18