Given:
Principal investment = $1,000
$1,000 (Original investment) x .13 (Percentage loss) = $130
Balance for April = $1,000 - $130 = $870
$870 (Beginning balance in May) x .13 (Percentage gain) = $113.1
Ending value for May = $870 + $113.1 = $983.10
The value of your account is $983.10 as of the end of May.