30 adults and 60 children visit a theme park. the admission price is £40 for an adult and £30 for a child.
36 of the visitors have a voucher, which gives them 10% off the admission. twice as many children than adults do not have a voucher.
calculate the total paid for admission of the 30 adults and 60 children

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap