Answer:£[tex]74.2[/tex]
Step-by-step explanation:
Given
Cost of [tex]40[/tex] liters of petrol is £[tex]42.40[/tex]
Using Unitary method
[tex]40[/tex] liters cost ↔£[tex]42.40[/tex]
[tex]1[/tex] liter cost ↔ [tex]\dfrac{42.40}{40}=1.06[/tex]
[tex]70\ \text{liters cost}\ \rightarrow1.06\times 70=[/tex]£[tex]74.2[/tex]
