Sequences A-level Maths Edexcel Question????

Student A is taking part in a sponsored cycle ride.
He plans to cycle 1000 km over a number of days.
On Day One student A cycles 50km.
He plans to cycle 12 km more each day than he had cycled the previous day. He will stop cycling when he reaches 1000km.
(a) Show that student A will finish the ride on Day Ten by cycling 118km.

Student B also plans to cycle 1000km over a number of days.
On Day One she cycles dlm.
Student B plans to cycle 2% further each day than she has cycled the previous day.
Given that she will take 8 complete days to cycle the 1000km.
(b) find the value of d, giving your answers to 2 decimal places.