Answer:
[tex] \boxed{ \bold{ \boxed{ \sf {11.11\%}}}}[/tex]
Step-by-step explanation:
Given,
Cost price of three thermos flask = 1080
Selling price of each thermos flask = 400
Finding the selling price of three thermos flask
Since, the cost of 3 thermos flask is more than that of 1 thermos flask. So, the cost of 1 thermos flask is multiplied by 3 ( i.e 400 × 3 = 1200 )
Here, the selling price is greater than cost price.
So, there is profit.
And we know that,
[tex] \sf{profit = sp \: - \: cp}[/tex]
⇒[tex] \sf{1200 - 1080}[/tex]
⇒[tex] \sf{120}[/tex]
Profit amount = 120
Finding the profit percentage
[tex] \sf{profit\% \: = \frac{profit}{cp} \times 100 \%}[/tex]
⇒[tex] \sf{ \frac{120}{1080 } \times 100\%} [/tex]
⇒[tex] \sf{11.11\%}[/tex]
Hope I helped!
Best regards!!