help me plsss..... im stuck

Answer:
411
Step-by-step explanation:
[tex]15 \div 100 \times 420 = 63[/tex]
[tex]420 - 63 = 357[/tex]
15
[tex]15 \div 100 \times 357 = 53.55[/tex]
this is the 15% up amount
[tex]357 + 53.55 = 410.55[/tex]
nearest whole number is 411