Well here's your answer straight <u><em>he must pay 29.82$ </em></u>and here's my work,
- 20% of 35 is 7 and since its 20% off we must subtract 35-7=28
- Next it said there's a 6.5 tax so that means we are adding on to 28$
- 6.5 of 28 is 1.82 so we add 28+1.82 which equals your answer 29.82
Assuming 0x6A is given in base 16, first convert 
and 
to a common base, say base 10:
Then
3/8 times 2/5 is 6/40 or 0.15. Just multiply straight across
