PHYSICS PROBLEM - circular motion?

A car goes around a curve in a circular path at a speed of 98.0 km/h and experiences an acceleration of 8.69 m/s/s. What is the radius of the curve?
I've tried solving it a million ways but I just can't get it right! I used the acceleration formula:
a=v^2/R and it doesnt work :( help me pleaseee
Update: i did convert km/h to m/s and got it wrong :(... multiple times
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