The readings of a thermometer at 0^(@)C ...

The readings of a thermometer at `0^(@)C` and `100^(@)C` are `50 cm` and `75 cm` of mercury column respectively. Find the temperature at which its reading is `80 cm` of mercury column ?

`105^(@)C`

`110^(@)C`

`115^(@)C`

`120^(@)C`

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