Of his 94 compact discs, raul plans to donate 17 to the thrift store. to the nearest tenth of a percent, what percent is this?

For this case we can solve the problem by means of the following rule of three:
 94 > 100%
 17 > x
 Clearing x we have:
 x = (17/94) * (100)
 x = 18,08510638%
 To the nearest tenth of a percent:
 x = 18.1%
 
 This is 18.1% of his compact discs.