Answer :
you have to find 7% of each of the prices and then add that onto the original price...
adult increase... 1% of £1.20 = £0.12 x 7 (to find 7%) = £0.84
child increase... 1% of 80p = 0.8p x 7 (to find 7%) = 5.6p (rounded... 6p)
adult new price... £1.20 + £0.84 = £2.04
child new price... 80p +6p = 86p
adult and child added new price... £2.04 + £0.86 = £2.90
Hope this helps :)
adult increase... 1% of £1.20 = £0.12 x 7 (to find 7%) = £0.84
child increase... 1% of 80p = 0.8p x 7 (to find 7%) = 5.6p (rounded... 6p)
adult new price... £1.20 + £0.84 = £2.04
child new price... 80p +6p = 86p
adult and child added new price... £2.04 + £0.86 = £2.90
Hope this helps :)