something is telling me that u are a scammer
i dont know if its the fact that 10 euro will give u 5k nx and 10 megaphones cost only 2900
or the fact that 30 euro will give u 30k nx and 50 megaphons cost only 12K
so there is 2 options:
1) ur realy realy cant use a calculator
2) u want to scam pepole and get ur speakers for free