Explanation:
850÷100=17/2=8.5
8.5×24=204
850-204=646
646÷100=6.46
6.46×13=83.98 1st
646-83.98=562.02
562.02÷100=5.6202 2nd
5.6202×13=73.0626
562.02-73.0626=488.9574
488.9574÷100=4.889574 3rd
4.889574×13=63.564462
4.889574×13=63.564462
488.9574-63.564462=425.392938
425.392938÷100=4.25392938 4th
4.25392938×13=55.30108194
425.392938-55.30108194=370.0918561
370.0918561÷100=3.700918561 5th
3.700918561×13=48.11194129
370.0918561-48.11194129=321.9799148
321.9799148÷100=3.219799148 6th
3.219799148×13=41.85738893
321.9799148-41.85738893=280.1225259
280.1225259÷100=2.801225259 7th
2.801225259×13=36.41592836
280.1225259-36.41592836=243.7065975
I spent waaaaay to much time typing this
answer out I swear if it is incorrect I am done
£243.71