The Ball & Bat

$1.05

Let x represent the price of the ball. Therefore x + (x + $1.00) = $1.10
Doing a little math we get 2x + $1.00 = $1.10
Subtract $1.00 from both sides given us 2x=.10
Multiply both side by 1/2 gives us x=.05
If the ball ( X ) = .05 then the bat must cost $1.05
No calculator needed.
~Michael