show me the working for this question please.

6.the custom duty on imported vehicles is 30% of the price paid by the importer.

(a)calculate the customs duty on a car for which the price paid by the importer is 8,500.

(b)calculate the price paid by the importer for a bus for which the amount paid, including customs duty, is 15,600.

i got the first question but i cant seem t get the other one? please help me

I need a mathematics text book for C.x.c volume one it is an good text book

i bought a green cover book back then to help me to prepare for CXC. if i could recall.i think the name of the book was
mathematics general proficiency cxc solutions 1990-2000.the cover was green. and i think the basic math cover was red.plesae i need to get that green book.

hi there i would love to get help in my maths. today i did a test on factorizing and i did not feel that i pass and feel that i am weak. i do not hate maths but i am not passing it....

i would like to know more about the subjects

I need to order this textbook, the second edition ; how do I get hold of the publisher email address for price in US dollars plus shipping cost by airmail to Belize ?